學系成員

Journal Paper:

1. Wei-Sheng Liu*, Li-Cheng Huang, Deveshwar Sasikumar, Kuo-Jui Hu, Jiun-Yi Ye, and Balaji Gururajan*, “Controlling Temporal Plasma Dynamics for Growing Highly c-Axis-Oriented GaN Thin Films on Si(111) Substrates through Pulsed DC Magnetron Sputtering”, Surface & Coatings Technology, 535, 133687, 2026. (Rank: 2/25, IF: 6.9, MATERIALS SCIENCE, COATINGS & FILMS)
2. Yu-Han Huang, Yi-Tien Chiang, Bhavya Kondapavuluri, Pin-Chih Liu, Jhih-Han Lin, Wei-Sheng Liu, Jen-Inn Chyi, and Shih-Yen Lin*, “Graphene/Semiconductor Photodetectors Prepared by Molecular Beam Epitaxy”, IEEE Photonics Technology Letters,38, 1219 - 1222, 2026 (Rank: 60/125, IF: 2.5, OPTICS)
3. Bhavya Kondapavuluri, Wei-Sheng Liu*, Kai-Yang Hsu, Pin-Chih Liu, Jhih-Han Lin and Jen-Inn Chyi, “InAs/InGaAs Quantum Dots with Room Temperature Photoluminescence at 1380 nm by Sb Surfactant-Induced Strain Relaxation”, Appl. Phys. Lett. 128, 242103, 2026. (Rank: 67/187, IF: 3.6, PHYSICS, APPLIED - SCIE, SCIE)
4. Wei-Sheng Liu*, Po Hao Chang, Balaji Gururajan, Bhavya Kondapavuluri, Tsun-Jie Ko, Ming-En Hsu, Yung-Jyun Liao and Jen-Inn Chyi, “Impact of Arsenic Species on InAs/GaSb Type II Superlattice Grown by Molecular Beam Epitaxy”, J. Vac. Sci. Technol. A 44, 032704, 2026 (Rank: 72/160, IF: 2.9, PHYSICS, APPLIED - SCIE)
5. Gururajan, Balaji*; Sasikumar, Deveshwar; Rinshun Paul, Done ; Wei-Sheng Liu*; Kondapavuluri, Bhavya; Srinivasan, Parthasarathy; Madanagurusamy, Sridharan; Kulandaisamy, Jenifer, “Copper-Doped Chromium Oxide Delafossite: Sputtering Process, Material Properties, and Device Applications: A Detailed Review”, ACS Omega, 10 (47), 56883-56912, 2025 (Rank: 81/239, IF: 4.3, CHEMISTRY, MULTIDISCIPLINARY, SCI,EI)
6. K. Jenifer, Balaji Gururajan*, Wei-Sheng Liu, S. Parthiban, “Numerical Investigation of Eco-Friendly All-Zinc Based Thin Film Solar Cells For Sustainable Photovoltaics”, Advanced Theory and Simulations, Volume8, Issue11, e00157, 2025, (Rank: 37/135, IF: 2.9, MULTIDISCIPLINARY SCIENCES, SCI,EI)
7. Wei-Sheng Liu*, Yun-Jui Yeh, Tsung-An Yang, G. Balaji*, Deveshwar Sasikumar, Bhavya Kondapavuluri, Yu-En Chen, Sindu Gnanan A. B, Sriranjani. S, Sridharan Madhanagurusamy, “Optimizing the Sputtering Growth of P-Type CuCrO2 Thin Films for Enhancing their Crystal Orientation and Optoelectronic Characteristics”, Journal of Alloys and Compounds, 1036, 181478, 2025. (Rank: 11/96, IF: 6.3, METALLURGY & METALLURGICAL ENGINEERING, SCI,EI)
8. Venkatesh N., Deveshwar S., Balaji G., Wei-Sheng Liu*, Sheng Hsiang Kao, and Ting-Rui Hsu, “Hard X-Ray Detection by Using β-Ga₂O₃ Devices Fabricated Through Radiofrequency Sputtering”, J. Vac. Sci. Technol. A, 43, 043407, 2025 (Rank: 96/179, IF:2.4, PHYSICS)
9. Balaji Gururajan*, Bhavya Kondapavuluri, Venkatesh Narasihman, Wei-Sheng Liu* and Snehal Mondal, “Experimental fabrication and Computational modelling of CuO-based semi-transparent solar cells with DMD top contacts”, Physica Scripta, 100, 065973, 2025 (Rank: 37/112, IF:2.6, PHYSICS)
10. Wei-Sheng Liu*, Ting-Kai Yang, Ming-En Hsu, Kai-Yang Hsu, Bhavya Kondapavuluri, and Jen-Inn Chyi, “Fabrication of InAs 2D submonolayer nanostructure-based solar cells with InGaAs/GaAsSb double-well structure”, Optical Materials, 159, 116576, 2025 (Rank: 29/119, IF:3.8, OPTICS)
11. Wei-Sheng Liu*, Sui-Hua Wu, Balaji. G, Li-Cheng Huang, Chung-Kai Chi, Kuo-Jui Hu, Hsing-Chun Kuo, “Studies on high quality GaN/AlN deposited on Glass substrates by Radio-Frequency Reactive Sputtering”, Applied Physics A, 130, 801, 2024. (Rank: 87/179, IF:2.5, PHYSICS, APPLIED)
12. Balaji. G*, Atheek Posha, Wei-Sheng Liu*, Bhavya Kondapavuluri, Abhishek T.T, Perumal Thathireddy, Venkatesh. N, “Enhanced Efficiency of Thin-Film Solar Cells via Cation-Substituted Kesterite Absorber Layers and Non-Toxic Buffers: A Numerical Study”, physica status solidi (b) basic solid state physics, 2400238, 2024 (Rank: 51/69, IF:1.782, CATEGORYPHYSICS, CONDENSED MATTER)
13. Wei-Sheng Liu*, Sui-Hua Wu, Balaji. G., Li-Cheng Huang, Chung-Kai Chi, Hsing-Chun Kuo, “Optimization of high-quality gallium nitride thin films deposited on silicon substrates with an aluminum nitride buffer layer through radio-frequency magnetron sputtering”, Vacuum, 227, 113352, 2024 (Rank: 48/160, IF: 3.9, PHYSICS, APPLIED - SCIE)
14. Zon, Tzu-Wei Lo, Zhen-Lun Li, Samatcha Vorathamrong, Chao-Chia Cheng, Chun-Nien Liu, Chun-Te Chiang, Li-Wei Hung, Ming-Sen Hsu, Wei-Sheng Liu, Jen-Inn Chyi, Charles W. Tu*, “Tuning the emission wavelength by varying the Sb composition in InGaAs/GaAsSb 'W' quantum wells grown on GaAs (001) substrates,” J. Vac. Sci. Technol. A 42, 032709, 2024 (Rank: 72/160, IF: 2.9, PHYSICS, APPLIED - SCIE)
15. Zon, Samatcha Voranthamrong, Chao-Chia Cheng, Tzi-Wei Luo, Chen-Lun Lee, Chun-Nien Liu, Chun-De Chiang, Li-Wei Hung, Ming-Sen Hsu, Wei-Sheng Liu, Jen-Inn Chyi, and Charles W. Tu*, “The effects of strain compensation in type-II GaAsSb/InGaAs quantum wells grown on GaAs (001) substrates,”, J. Appl. Phys. 135, 044301, 2024 (Rank: 62/160, IF: 3.2 PHYSICS, APPLIED - SCIE)
16. Balaji. G*, Bhavya Kondapavuluri, Wei-Sheng Liu*, Balasundaraprabhu. R, Prasanna. S, “Comparative study of Indium Tin Oxide and Indium Gallium Zinc Oxide as potential n-type materials for the fabrication of all inorganic transparent solar cells”, Materials Letters, 358, 135876, 2024 (Rank: 69/160, IF: 2.7 PHYSICS, APPLIED)
17. Wei-Sheng Liu*, Yu-Lin Chang, Tzu-Chun Chen, Shih-Chen Yu, and Hsing-Chun Kuo, “Si–Sn codoped n-GaN film sputtering grown on an amorphous glass substrate”, Semicond. Sci. Technol., 38, 075010, 2023 (Rank: 124/293, IF: 2.65, Material Science, Multidisciplinary- SCIE) DOI 10.1088/1361-6641/acce5d
18. Wei-Sheng Liu*, Balaji. G, Sui-Hua Wu, Li-Cheng Huang, Chung-Kai Chi, Yu-Lun Jiang and Hsing-Chun Kuo, “Optimal growth conditions for forming c-axis (002) aluminum nitride thin films as a buffer layer for hexagonal gallium nitride thin films produced with in situ continual radio frequency sputtering”, Micromachines, 13, 1546, 2022 (IF: 3.523, SCI,EI)
19. Wei-Sheng Liu*, Chih-Hao Hsu, Yu-Jiang, Yi-Chun Lai, and Hsing-Chun Kuo, “Improving device characteristics of dual-gate IGZO thin-film transistors with Ar-O₂ mixed plasma treatment and rapid thermal annealing”, Membranes, 12(1), 49, 2022. (Rank: 21/90, IF: 4.106, SCI,EI)
20. Wei-Sheng Liu*, Chien-Sheng Huang, Shih-Yuan Chen, Ming-Yuan Lee and Hsing-Chun Kuo*, “Investigation of Cu2ZnSnS4 thin film with preannealing process and ZnS buffer layer prepared by magnetron sputtering deposition”, Journal of Alloys and Compounds , 884, 161015, 2021. (Rank: 4/76, IF: 5.32, SCI,EI)
21. Wei-Sheng Liu*, Chih-Hao Hsu, Yu-Jiang, Yi-Chun Lai, and Hsing-Chun Kuo*, “Improvement of device characteristics of plasma-treated indium gallium zinc oxide thin-film transistors through thermal annealing”, Semicond. Sci. Technol. 36, 045007, 2021 (Rank: 124/293, IF: 2.65, Material Science, Multidisciplinary- SCIE)
22. Wei-Sheng Liu*, Shih-Yuan Chen, Chien-Sheng Huang, Ming-Yuan Lee and Hsing-Chun Kuo*, “Investigation of Zn/Sn ratio for improving the material quality of CZTS thin films with the reduction of Cu2-xS secondary phase”, Journal of Alloys and Compounds, 853, 157237, 2021. (Rank: 4/76, IF: 5.32, SCI,EI)
23. Wei-Sheng Liu*, Yu-Lin Chang, Chun-Yuan Tan, Cheng-Ting Tsai and Hsing-Chun Kuo*, “Properties of n-type GaN thin film with Si-Ti codoping on a glass substrate”, Crystals, 10, 582 2020. (Rank: 10/26, IF: 2.59, Crystallography- SCIE)
24. Wei-Sheng Liu*, Chien-Lung Huang, Yi-Hung Lin, Chih-Hao Hsu and Yi-Ming Chu, “Improving device characteristics of IGZO thin-film transistors by using pulsed DC magnetron sputtering deposition”, Semiconductor Science and Technology, 35, No.2, 025004, 2019 (Rank: 124/293, IF: 2.65, Material Science, Multidisciplinary- SCIE) (https://doi.org/10.1088/1361-6641/ab592a)
25. Wei-Sheng Liu*, Ting-Kai Yang, Wei-Jen Hsueh, Jen-Inn Chyi, Tien-Yuan Huang, Ming-En Hsu, “Improved optical properties of InAs submonolayer quantum dots in GaAsSb/InGaAs double-well structure” Appl. Phys. Lett. 115, 093103, 2019. (Rank: 31/148, IF: 3.52, PHYSICS, APPLIED - SCIE, SCIE)
26. Wei-Sheng Liu*, Yu-Lin Chang and Hui-Yu Chen, “Growth of GaN Thin Film on Amorphous Glass Substrate by Direct-Current Pulse Sputtering Deposition Technique”, Coatings, 9, 419, 2019 (Rank: 7/20, IF: 2.88, Materials Science, Coating and Films, SCIE).
27. Wei-Sheng Liu*, Wei-Ting Hsieh, and Shih-Yuan Chen, and Chien-Sheng Huang, “Improvement of CIGS solar cells with high performance transparent conducting Ti-doped GaZnO thin films”, Solar Energy 174:83-96, 2018 (Rank:23/97, IF: 5.742, Energy & Fuels, SCI).
28. Wei-Sheng Liu*, Yi-Hung Lin, Chien-Lung Huang, and Chih-Wei Wang, “Device Performance Improvement of Transparent Thin-Film Transistors with a Ti-doped GaZnO/ InGaZnO/ Ti-doped GaZnO Sandwich Composite-Channel Structure”, IEEE Transactions on Electron Devices, Volume 64, No. 6, 64 (2), pp 2533–2541, 2017 (Rank:37/249, IF: 2.6, Engineering, Electrical & Electronic, SCI)
29. Wei-Sheng Liu*, Ren-Yo Liu, and Hsiao-Chien Lin, “Tailoring energy band alignment of vertically aligned InGaAs quantum dots capped with GaAs(Sb)/AlGaAsSb composite structure after thermal annealing treatment”, ACS Photonics, 4 (2), pp 242–250, 2017 (Rank:6/90, IF: 7.14, OPTICS, SCI)
30. Wei-Sheng Liu*, Hsiao-Chien Lin, and Ren-Yo Liu, “Capping vertically aligned InGaAs/GaAs(Sb) quantum dots with a AlGaAsSb spacer layer in intermediate-band solar cell devices”, Progress in Photovoltaics: Research and Applications, Volume 25, Issue 1:76–86, 2017 (Rank: 4/89, IF: 9.696, Energy & Fuels, SCI/EI)
31. Wei-Sheng Liu *, Ying-Fu Chen, Yu-Ming Wang, “Capping Ti-Doped GaZnO on InGaZnO layer as the composite-channel structure for enhancing the device performances and stability of thin-film transistors”, IEEE/OSA Journal of Display Technology, PP (99), 7559808, 2016 (Rank: 47/249, IF: 2.24, ENGINEERING, ELECTRICAL & ELECTRONIC, SCI/EI)
32. Wei-Sheng Liu*, Yu-Ming Wang, “Enhancing transparent thin-film transistor device performances by using the Ti-doped GaZnO channel layer”, RSC Advances, 5, 104392 – 104399, 2015 (Rank: 33/157, IF: 3.84, Chemistry, SCI/EI)
33. Wei-Sheng Liu, Huai-Ming Cheng, Hung-Chun Hu, Hau-Wei Yu, Nen-Wen Pu*, and Shih-Chang Liang, “Indium tin oxide with titanium doping for transparent conductive film application on CIGS solar cells” Applied Surface Science, 354(Part A), 31-35, 2015. (Rank: 1/18, IF: 3.39, MATERIALS SCIENCE, COATINGS & FILMS, SCI,EI)
34. Nen-Wen Pu, Wei-Sheng Liu*, Huai-Ming Cheng, Hung-Chun Hu, Wei-Ting Hsieh, Hau-Wei Yu, and Shih-Chang Liang, “Investigation of the Optoelectronic Properties of Ti-doped Indium Tin Oxide Thin Film” Materials, 8(9), 6471-6481, 2015 (Rank: 63/271, IF: 2.728, MATERIALS SCIENCE,)
35. Wei-Sheng Liu*, Hung-Chun Hu, Nen-Wen Pu, and Shih-Chang Liang, “Developing Flexible CIGS Solar Cells on Stainless Steel Substrates by using Ti/TiN Composite Structures as the Diffusion Barrier Layer”, Journal of Alloys and Compounds, 631, 146-152, 2015. (Rank: 4/76, IF: 4.18, SCI,EI)
36. Wei-Sheng Liu*, Ting-Fu Chu, and Tien-Hao Huang, “Energy band structure tailoring of vertically aligned InAs/GaAsSb quantum dot structure for intermediate-band solar cell application by thermal annealing process” , Optics Express, 22(25), pp. 30963–30974, 2014 (Rank: 5/80, IF: 3.75, OPTICS - SCIE)
37. Jung-Y. Huang, Chien-Y. Lin, Wei-Sheng Liu, and Jen-Inn Chyi, “Quantum control study of ultrafast optical responses in semiconductor quantum dot devices” Optics Express, 22(25), pp.30815-30825, 2014 (Rank: 5/80, IF: 3.75, OPTICS - SCIE)
38. Wei-Sheng Liu*, Shen-Yu Wu, Chao-Yu Hung, Ching-Hsuan Tseng, and Yu-Lin Chang, “Improving the Optoelectronic Properties of Gallium ZnO Transparent Conductive Thin Films through Titanium Doping”, Journal of Alloys and Compounds, 616, 268-274, 2014. (Rank: 4/76, IF: 4.18, SCI,EI)
39. Wei-Sheng Liu*, and Ching-Min Chang, “Capping InAs Quantum Dots with an InGaAsSb Strain-Reducing Layer to Improve Optical Properties and Dot-Size Uniformity”, Thin Solid Film, 570, 490-495, 2014 (Rank: 5/17, IF: 1.935, SCI, EI)
40. Wei-Sheng Liu*, Shen-Yu Wu, Ching-Hsuan Tseng, and Chao-Yu Hung, “Quality Improvement of High-performance Transparent Conductive Ti-Doped GaZnO Thin Film”, Thin Solid Film, 570, 568-573, 2014 (Rank: 5/17, IF: 1.935, SCI, EI)
41. Chih-Hao Chang*, Wei-Sheng Liu*, Shen-Yu Wu, Jun-Lin Huang, Chao-Yu Hung, Yu-Lin Chang, Ying-Chieh Wu, Wei-Chih Chen and Yi-Cheng Wu, “Ga-doped TiZnO Transparent Conductive Oxide used as an alternate anode in blue, green, and red phosphorescent OLEDs”, Physical Chemistry Chemical Physics, 16, 19618-19624, 2014 (Rank: 5/33, IF: 4.49, SCI,EI)
42. Wei-Sheng Liu*, Hsin-Lun Tseng, and Po-Chen Kuo, “Enhancing optical characteristics of InAs/InGaAsSb quantum dot structures with long-excited state emission at 1.31 μm”, Optics Express, 22(16), pp. 18860-18869, 2014 (Rank: 5/80, IF: 3.75, OPTICS - SCIE)
43. Wei-Sheng Liu*, W.-K. Chen, S.-Y. Wu, and K.-P. Hsueh, “Improved Crystal Quality of Transparent Conductive Ga-doped ZnO Films by Magnesium Doping Through Radio-Frequency Magnetron Sputtering Preparation” Journal of the American Ceramic Society, 97, 473-480, 2014. (Rank: 1/25, IF: 2.841, SCI,EI)
44. Wei-Sheng Liu*, S.-Y. Wu, C.-H. Tseng, and C.-Y. Hung, “Development of high-quality titanium-doped gallium ZnO transparent conductive films by RF magnetron sputtering techniques” Physica Status Solidi C, 10, 1569, 2013 (EI)
45. Wei-Sheng Liu*, Y.-T. Wang, C.-M. Chang, W.-Y. Qiu, and C. Fang, “Study of carry dynamics of vertically aligned InAs/GaAsSb quantum dot structures” Physica Status Solidi C, 10, 1489, 2013 (EI)
46. Wei-Sheng Liu*, Yen-Ting Wang, Wen-Yu Qiu, and Chi Fang, “Carrier Dynamics of a Type-II Vertically Aligned InAs Quantum Dot Structure with a GaAsSb Strain-Reducing Layer” Appl. Phys. Express, 6, 085001, 2013. (Rank: 22/127, IF: 2.57, SCI,EI)
47. Wei-Sheng Liu*, “Enhancing device characteristics of 1.3 μm emitting InAs/GaAs quantum dot lasers through dot-height uniformity study”, Journal of Alloys and Compounds 571, 153-158, 2013. (Rank: 4/76, IF: 4.18,SCI,EI)
48. Wei-Sheng Liu*, Y.-H. Liu, W.-K. Chen and K.-P. Hsueh, “Transparent Conductive Ga-doped MgZnO/Ag/ Ga-doped MgZnO Sandwich Structure with improved conductivity and transmittance”, Journal of Alloys and Compounds, 564, 105-113, 2013 (Rank:4/76, IF: 4.18 ,SCI, EI)
49. Wei-Sheng Liu*, Wei-Ku Chen, Kuang-Po Hsueh, “Transparent conductive Ga-doped MgxZn1−xO films with high optical transmittance prepared by radio frequency magnetron sputtering”, Journal of Alloys and Compounds, 552, 255-263, 2013(Rank:4/76, IF: 4.18, SCI, EI)
50. Wei-Sheng Liu*,Hong-Ming Wu, Fu-Hsiang Tsao, Tsan-Lin Hsu, Jen-Inn Chyi, "Improving the characteristics of intermediate-band solar cell devices using a vertically aligned InAs/GaAsSb quantum dot structure", Solar Energy Materials and Solar Cells, 105, 237–241, 2012(Rank:28/251, IF: 5.337,SCI, EI)
51. Wei-Sheng Liu*, Hsin-Lun Tseng, Tien-Hao Huang, Ting-Fu Chu, Po-Chen Kuo, Fu-Hsiang Tsao, and Jen-Inn Chyi “Characteristic improvements of vertically aligned columnar quantum dot solar cell with a GaAsSb capping layer”, Proceedings of SPIE (Proc. SPIE), Vol. 8471, pp. 21, 2012. (EI)
52. Wei-Sheng Liu*, H.-M. Wu, Y.-A. Liao, J.-I. Chyi, W.-Y. Chen, and T.-M. Hsu, “High Optical Property Vertically Aligned InAs Quantum Dot Structures with GaAsSb Overgrown Layers”, J. Cryst. Growth, 323, 164, 2011. (Rank:81/232, IF: 1.726, SCI, EI)
53. Hsueh, K.-P., Cheng, Y.-C., Lin, W.-Y., Chiu, H.-C., Huang, Y.-P., Chi, G.-C., Liu, W.-S., “Physical properties of Al-doped MgZnO film grown by RF magnetron sputtering using ZnO/MgO/Al 2O 3 target”, Proceedings of SPIE - The International Society for Optical Engineering, 8110, September 13, 2011. (EI)
54. D.-C. Wu, Y.-C. Un, M.-H. Mao, W.-S. Liu, P.-C. Chiu, J.-I. Chyi, J.-S. Wang, G. Lin, J.-Y. Chi, “Temperature dependences of quantum-dot laser thresholds under simultaneously three-state or two-state lasing operations”, Conference on Quantum Electronics and Laser Science Conference on Lasers and Electro-Optics, CLEO/QELS, 2008 (EI)
55. J.-I. Chyi*, W.-S. Liu, P.-C Chiu, M.-J Shiau, David M.-T Kuo, W.-Y. Chen, H.-S. Chang, and T. M. Hsu, “High Quality InAs Quantum Dots with an In(Ga, Al)AsSb Strain-Reducing Layer for Long Wavelength Photonic Devices”, ECS Trans.6 (2), 35-40, May, 2007. (NSC 94-2215-E-008-004, 94-2752-E-008-001-PAE, and 93-2120-M-008-001)(EI)
56. Chiu, P.-C., Liu, W.-S., Shiau, M.-J., Chyi, J.-I., Chen, W.-Y., Chang, H.-S., Hsu, T.-M., “High optical quality of InAs quantum dots with an InAlAsSb strain-reducing layer”, Conference Proceedings - International Conference on Indium Phosphide and Related Materials, 2007. (EI)
57. Y.-T. Li, J.-W. Shi*, C.-L. Pan, C.-H. Chiu, W.- S. Liu, N.-W. Chen, C.-K. Sun, and J.-I. Chyi, “Sub-THz Photonic - Transmitters Based on Separated -Transport- Recombination Photodiodes and a Micromachined Slot Antenna”, IEEE Photon. Tech, Lett. 19, 840-842, June, 2007. (Rank:42/245,SCI, EI)
58. J.-S. Hwang*, H.-C. Lin, C.-K. Chang, T.-S. Wang, L.-S. Chang, J.-I. Chyi, W.-S. Liu, S.-H. Chen, H.-H. Lin and P.-W. Liu, “The dependence of terahertz radiation on the built-in electric field in semiconductor microstructures”, Opt. Express 15, 5120-5125, April, 2007. (Rank:6/79, SCI, EI)
59. P.-C Chiu, W.-S. Liu, M.-J Shiau, J.-I. Chyi*, W.-Y. Chen, H.-S. Chang, and T. M. Hsu, “Enhancing the optical properties of InAs quantum dots by an InAlAsSb overgrown layer”, Appl. Phys. Lett. 91, 153106, Oct., 2007. (Rank:17/125,SCI, EI)
60. W.-S. Liu, David M.-T Kuo, J.-I. Chyi*, W.-Y. Chen, H.-S. Chang, and T. M. Hsu, “Enhanced thermal stability and emission intensity of InAs quantum dots covered by InGaAsSb strain-reducing layer”, Appl. Phys. Lett., 89, 243103, Dec., 2006. (Rank:17/125,SCI, EI)
61. W.-S. Liu, H. Chang, Y.-S. Liu, and J.-I. Chyi*, “Pinhole-Like Defects in Multi-Stack 1.3 mm InAs Quantum Dot Laser”, J. Appl. Phys., 99, 114514, June, 2006. (NSC 94-2215-E-008-004) (Rank:37/125,SCI, EI)
62. T.-F. Kao, H.-H. Chang, L.-J. Chen, J.-Y. Lu, A.-S. Liu, Y.-C. Yu, R.-B. Wu, W.-S. Liu, J.-I. Chyi, and C.-K. Sun*, “Frequency tunability of terahertz photonic transmitters”, Appl. Phys. Lett. 88, 093501, Feb., 2006. (Rank:17/125,SCI, EI)
63. J.-W. Shi*, Y.-T. Li, M.-L. Lin, Y.-S. Wu, W.-S. Liu, J.-I. Chyi , and C.-L. Pan, “Bandwidth Enhancement Phenomenon of a High-Speed GaAs-AlGaAs Based Unitraveling Carrier Photodiode with an Optimally Designed Absorption-Layer at an 830 nm Wavelength”, Appl. Phys. Lett. 89, 053512, Aug., 2006. (Rank:17/125,SCI, EI)
64. J.-Y. Lu, L.-J. Chen, T.-F. Kao, H.-H. Chang, C.-K. Sun, A-S. Liu, Y.-C. Yu, R.-B. Wu, W.-S. Liu, J.-I. Chyi, “Terahertz biochip for illicit drug detection”, Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, CLEO/QELS 2006 (EI)
65. J.-W. Shi, Y.-T. Li, C.-L. Pan, M.-L. Lin, Y.-S. Wu, W.-S. Liu, J.-I. Chyi, “Separated-transport-recombination p-i-n photodiode (STR-PD) with high-speed and high-power performance under Continuous-Wave (CW)”, Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, CLEO/QELS 2006 (EI)
66. T.-F. Kao, L.-J. Chen, H.-H. Chang, J.-Y. Lu, A.-S. Liu, Y.-C. Yu, R.-B. Wu, W.-S. Liu, J.-I. Chyi, C.-K. Sun, “Broadband-response and frequency-tunable terahertz photonic transmitters with high efficiency”, Optics InfoBase Conference Papers (EI) 2006
67. J.-Y. Lu, L.-J. Chen, T.-F. Kao, H.-H. Chang, H.-W. Chen, A.-S. Liu, Y.-C. Chen, R.-B. Wu, W.-S. Liu, J.-I. Chyi , and C.-K. Sun*, “Terahertz Microchip for Illicit Drug Detection”, IEEE Photonics Technology Letters, 18, 2254-2256, 2006 (NSC 94-2215-E-002-007) (Rank:42/245,SCI, EI)
68. J.-W. Shi*, H.-C. Hsu, F.-H. Huang, W. -S. Liu, J.-I. Chyi, J.-Y. Lu, C.-K. Sun, and C.-L. Pan, “Separated-Transport-Recombination p-i-n Photodiode for High-Speed and High-Power Performance”, IEEE Photonics Technology Letters, Vol.17, 1722-1724, Aug., 2005. (NSC 92-2218-E-008-011, and 93-2215-E-008-022) (Rank:42/245,SCI, EI)
69. Lu, J.-Y., Chen, L.-J., Kao, T.-F., Chang, H.-H., Liu, A.-S., Yu, Y.-C., Wu, R.-B., Liu, W.-S., Chyi, J.-I., Pan, C.-L., Tsai, M.-C., Sun, C.-K., “Terahertz biochip based on optoelectronic devices”, Proceedings of SPIE - The International Society for Optical Engineering, 2005 (EI)
70. W.-S. Liu, Holin Chang, and J.-I. Chyi, “Effects of dot-height uniformity on the performance of 1.3 um InAs quantum dot lasers”, 5th IEEE Conference on Nanotechnology, 2005. (EI)
71. W.-S. Liu, and J.-I. Chyi*, “Optical Properties of InAs Quantum Dots with InAlAs/InGaAs Composite Matrix”, J. Appl. Phys. Vol.97, 024312-024314, Jan. 2005. (NSC 91-2120-E-008-001) (Rank:37/125,SCI, EI)
72. J.-I. Chyi , W.-S. Liu, T.-P. Hsieh, T. M. Hsu, W. H. Chang, W. Y. Chen and H. S. Chang, “Progress on InAs-Based Quantum Dot Light Emitters”, 208 th Meeting of the Electrochemical Society (ECS), Los Angeles, U.S.A., 2005. (EI)
73. T.-F. Kao, L.-J. Chen, H.-H. Chang, J.-Y. Lu, A.-S. Liu, Y.-C. Yu, R.-B. Wu, W.-S. Liu, J.-I. Chyi, C.-K. Sun, “Broadband-response and frequency-tunable terahertz photonic transmitters with high efficiency”, IEEE Conference on Lasers and Electro-Optics, Baltimore, U.S.A., 2005 (EI)
74. W.-S. Liu, and J.-I. Chyi, “Optical properties of InAs quantum dots with InAlAs/InGaAs composite matrix”, 16th Intl. Conf. InP Related Materials, Kagoshima, Japan, 2004 (EI)
75. L. Jiang, S.-S. Li*, W.-S. Liu, N.-T. Yeh and J.-I. Chyi, “A Two-Stack, Multi-Color In_0.5Ga_0.5As/GaAs and InAs/GaAs Quantum Dot Infrared Photodetector for Long Wavelength Infrared Detection”, Infrared Physics and Technology, Vol.46, 249-256, Jan., 2005. (NSC 91-2120-E-008-001) (SCI, EI)
76. H.-C. Chiu, S.-C. Yang, Y.-J. Chan*, S.-H. Chen, W.-S. Liu and J.-I. Chyi,” The microwave power performance comparisons of Al_xGa_1-xAs/In_0.15Ga_0.85As (x=0.3, 0.5, 0.7, 1.0) doped-channel HFETs”, Electron Devices, Vol. 51, 156 – 158, Jan. 2004. (NSC 90-2219-E-008-003) (SCI, EI)
77. M.-C. Tien, H.-H. Chang, J.-Y. Lu, L.-J. Chen, S.-Y. Chen, R.-B. Wu, W.-S. Liu, J.-I Chyi and C.-K. Sun*, “Device saturation behavior of submillimeter-wave membrane photonic transmitters”, IEEE Photonics Technology Letters, Vol. 16, 873 – 875, March, 2004. (Rank:42/245,SCI, EI)
78. C.-K. Sun, M.-C. Tien, H.-H. Chang, J.-Y. Lu, L.-J. Chen, S.-Y. Chen, R.-B. Wu, W.-S. Liu, J.-I. Chyi, “Conversion efficiency and device behavior of edge-coupled membrane photonic transmitters”, Lasers and Electro-Optics Society, LEOS, 2003 (EI)
79. N.-T. Yeh, W.-S. Liu, S.-H. Chen, P.-C. Chiu, and J.-I. Chyi*, “InAs/GaAs quantum dot lasers with InGap cladding layer grown by solid-source molecular-beam epitaxy”, Appl. Phys. Lett. 80, 4, 535-537, Jan., 2002. (Rank:17/125,SCI, EI)
80. N.-T. Yeh, W.-S. Liu, S.-H. Chen, J.-I. Chyi, “Effects of spacer thickness on the performance of InGaAs/GaAs quantum dot lasers”, Materials Research Society Symposium – Proceedings, 2001 (EI)
81. N.-T. Yeh, W.-S. Liu, S.-H. Chen, P.-J. Chiu, J.-I. Chyi, “InAs/GaAs quantum dot lasers with InGaP cladding layer grown by solid-source molecular beam epitaxy”, Conference Proceedings - International Conference on Indium Phosphide and Related Materials, 2001 (EI)

Wei-Sheng Liu*, Sui-Hua Wu, Balaji. G, Li-Cheng Huang, Chung-Kai Chi, Kuo-Jui Hu, Hsing-Chun Kuo, “Studies on high quality GaN/AlN deposited on Glass substrates by Radio-Frequency Reactive Sputtering”, Applied Physics A, 130, 801, (Rank: 87/179, IF:2.5, PHYSICS, APPLIED)

Balaji. G*, Atheek Posha, Wei-Sheng Liu*, Bhavya Kondapavuluri, Abhishek T.T, Perumal Thathireddy, Venkatesh. N, “Enhanced Efficiency of Thin-Film Solar Cells via Cation-Substituted Kesterite Absorber Layers and Non-Toxic Buffers: A Numerical Study”, physica status solidi (b) basic solid state physics, 2400238, 2024 (Rank: 51/69, IF:1.782, CATEGORYPHYSICS, CONDENSED MATTER)

Wei-Sheng Liu*, Sui-Hua Wu, Balaji. G., Li-Cheng Huang, Chung-Kai Chi, Hsing-Chun Kuo, “Optimization of high-quality gallium nitride thin films deposited on silicon substrates with an aluminum nitride buffer layer through radio-frequency magnetron sputtering”, Vacuum, 227, 113352, 2024 (Rank: 48/160, IF: 3.8, PHYSICS, APPLIED - SCIE)

Zon, Tzu-Wei Lo, Zhen-Lun Li, Samatcha Vorathamrong, Chao-Chia Cheng, Chun-Nien Liu, Chun-Te Chiang, Li-Wei Hung, Ming-Sen Hsu, Wei-Sheng Liu, Jen-Inn Chyi, Charles W. Tu*, “Tuning the emission wavelength by varying the Sb composition in InGaAs/GaAsSb 'W' quantum wells grown on GaAs (001) substrates,” J. Vac. Sci. Technol. A 42, 032709, 2024 (Rank: 72/160, IF: 2.9, PHYSICS, APPLIED - SCIE)

Zon, Samatcha Voranthamrong, Chao-Chia Cheng, Tzi-Wei Luo, Chen-Lun Lee, Chun-Nien Liu, Chun-De Chiang, Li-Wei Hung, Ming-Sen Hsu, Wei-Sheng Liu, Jen-Inn Chyi, and Charles W. Tu*, “The effects of strain compensation in type-II GaAsSb/InGaAs quantum wells grown on GaAs (001) substrates,”, J. Appl. Phys. 135, 044301, 2024 (Rank: 62/160, IF: 3.2 PHYSICS, APPLIED - SCIE)

Balaji. G*, Bhavya Kondapavuluri, Wei-Sheng Liu*, Balasundaraprabhu. R, Prasanna. S, “Comparative study of Indium Tin Oxide and Indium Gallium Zinc Oxide as potential n-type materials for the fabrication of all inorganic transparent solar cells”, Materials Letters, 358, 135876, 2024 (Rank: 69/160, IF: 2.7 PHYSICS, APPLIED)

Wei-Sheng Liu*, Yu-Lin Chang, Tzu-Chun Chen, Shih-Chen Yu, and Hsing-Chun Kuo, “Si–Sn codoped n-GaN film sputtering grown on an amorphous glass substrate”, Semicond. Sci. Technol., 38, 075010, 2023 (Rank: 124/293, IF: 2.65, Material Science, Multidisciplinary- SCIE) DOI 10.1088/1361-6641/acce5d

Wei-Sheng Liu*, Balaji. G, Sui-Hua Wu, Li-Cheng Huang, Chung-Kai Chi, Yu-Lun Jiang and Hsing-Chun Kuo, “Optimal growth conditions for forming c-axis (002) aluminum nitride thin films as a buffer layer for hexagonal gallium nitride thin films produced with in situ continual radio frequency sputtering”, Micromachines, 13, 1546, 2022 (IF: 3.523, SCI,EI)

Wei-Sheng Liu*, Chih-Hao Hsu, Yu-Jiang, Yi-Chun Lai, and Hsing-Chun Kuo, “Improving device characteristics of dual-gate IGZO thin-film transistors with Ar-O₂ mixed plasma treatment and rapid thermal annealing”, Membranes, 12(1), 49, 2022. (Rank: 21/90, IF: 4.106, SCI,EI)

Wei-Sheng Liu*, Chien-Sheng Huang, Shih-Yuan Chen, Ming-Yuan Lee and Hsing-Chun Kuo*, “Investigation of Cu2ZnSnS4 thin film with preannealing process and ZnS buffer layer prepared by magnetron sputtering deposition”, Journal of Alloys and Compounds , 884, 161015, 2021. (Rank: 4/76, IF: 5.32, SCI,EI)

Wei-Sheng Liu*, Chih-Hao Hsu, Yu-Jiang, Yi-Chun Lai, and Hsing-Chun Kuo*, “Improvement of device characteristics of plasma-treated indium gallium zinc oxide thin-film transistors through thermal annealing”, Semicond. Sci. Technol. 36, 045007, 2021 (Rank: 124/293, IF: 2.65, Material Science, Multidisciplinary- SCIE)

Wei-Sheng Liu*, Shih-Yuan Chen, Chien-Sheng Huang, Ming-Yuan Lee and Hsing-Chun Kuo*, “Investigation of Zn/Sn ratio for improving the material quality of CZTS thin films with the reduction of Cu2-xS secondary phase”, Journal of Alloys and Compounds, 853, 157237, 2021. (Rank: 4/76, IF: 5.32, SCI,EI)

Wei-Sheng Liu*, Yu-Lin Chang, Chun-Yuan Tan, Cheng-Ting Tsai and Hsing-Chun Kuo*, “Properties of n-type GaN thin film with Si-Ti codoping on a glass substrate”, Crystals, 10, 582 2020. (Rank: 10/26, IF: 2.59, Crystallography- SCIE)

Wei-Sheng Liu*, Chien-Lung Huang, Yi-Hung Lin, Chih-Hao Hsu and Yi-Ming Chu, “Improving device characteristics of IGZO thin-film transistors by using pulsed DC magnetron sputtering deposition”, Semiconductor Science and Technology, 35, No.2, 025004, 2019 (Rank: 124/293, IF: 2.65, Material Science, Multidisciplinary- SCIE) (https://doi.org/10.1088/1361-6641/ab592a)

Wei-Sheng Liu*, Ting-Kai Yang, Wei-Jen Hsueh, Jen-Inn Chyi, Tien-Yuan Huang, Ming-En Hsu, “Improved optical properties of InAs submonolayer quantum dots in GaAsSb/InGaAs double-well structure” Appl. Phys. Lett. 115, 093103, 2019. (Rank: 31/148, IF: 3.52, PHYSICS, APPLIED - SCIE, SCIE)

Wei-Sheng Liu*, Yu-Lin Chang and Hui-Yu Chen, “Growth of GaN Thin Film on Amorphous Glass Substrate by Direct-Current Pulse Sputtering Deposition Technique”, Coatings, 9, 419, 2019 (Rank: 7/20, IF: 2.88, Materials Science, Coating and Films, SCIE).

Wei-Sheng Liu*, Wei-Ting Hsieh, and Shih-Yuan Chen, and Chien-Sheng Huang, “Improvement of CIGS solar cells with high performance transparent conducting Ti-doped GaZnO thin films”, Solar Energy 174:83-96, 2018 (Rank:23/97, IF: 5.742, Energy & Fuels, SCI).

Wei-Sheng Liu*, Yi-Hung Lin, Chien-Lung Huang, and Chih-Wei Wang, “Device Performance Improvement of Transparent Thin-Film Transistors with a Ti-doped GaZnO/ InGaZnO/ Ti-doped GaZnO Sandwich Composite-Channel Structure”, IEEE Transactions on Electron Devices, Volume 64, No. 6, 64 (2), pp 2533–2541, 2017 (Rank:37/249, IF: 2.6, Engineering, Electrical & Electronic, SCI)

Wei-Sheng Liu*, Ren-Yo Liu, and Hsiao-Chien Lin, “Tailoring energy band alignment of vertically aligned InGaAs quantum dots capped with GaAs(Sb)/AlGaAsSb composite structure after thermal annealing treatment”, ACS Photonics, 4 (2), pp 242–250, 2017 (Rank:6/90, IF: 7.14, OPTICS, SCI)

Wei-Sheng Liu*, Hsiao-Chien Lin, and Ren-Yo Liu, “Capping vertically aligned InGaAs/GaAs(Sb) quantum dots with a AlGaAsSb spacer layer in intermediate-band solar cell devices”, Progress in Photovoltaics: Research and Applications, Volume 25, Issue 1:76–86, 2017 (Rank: 4/89, IF: 9.696, Energy & Fuels, SCI/EI)

Wei-Sheng Liu *, Ying-Fu Chen, Yu-Ming Wang, “Capping Ti-Doped GaZnO on InGaZnO layer as the composite-channel structure for enhancing the device performances and stability of thin-film transistors”, IEEE/OSA Journal of Display Technology, PP (99), 7559808, 2016 (Rank: 47/249, IF: 2.24, ENGINEERING, ELECTRICAL & ELECTRONIC, SCI/EI)

Wei-Sheng Liu*, Yu-Ming Wang, “Enhancing transparent thin-film transistor device performances by using the Ti-doped GaZnO channel layer”, RSC Advances, 5, 104392 – 104399, 2015 (Rank: 33/157, IF: 3.84, Chemistry, SCI/EI)

Wei-Sheng Liu, Huai-Ming Cheng, Hung-Chun Hu, Hau-Wei Yu, Nen-Wen Pu*, and Shih-Chang Liang, “Indium tin oxide with titanium doping for transparent conductive film application on CIGS solar cells” Applied Surface Science, 354(Part A), 31-35, 2015. (Rank: 1/18, IF: 3.39, MATERIALS SCIENCE, COATINGS & FILMS, SCI,EI)

Nen-Wen Pu, Wei-Sheng Liu*, Huai-Ming Cheng, Hung-Chun Hu, Wei-Ting Hsieh, Hau-Wei Yu, and Shih-Chang Liang, “Investigation of the Optoelectronic Properties of Ti-doped Indium Tin Oxide Thin Film” Materials, 8(9), 6471-6481, 2015 (Rank: 63/271, IF: 2.728, MATERIALS SCIENCE,)

Wei-Sheng Liu*, Hung-Chun Hu, Nen-Wen Pu, and Shih-Chang Liang, “Developing Flexible CIGS Solar Cells on Stainless Steel Substrates by using Ti/TiN Composite Structures as the Diffusion Barrier Layer”, Journal of Alloys and Compounds, 631, 146-152, 2015. (Rank: 4/76, IF: 4.18, SCI,EI)

Wei-Sheng Liu*, Ting-Fu Chu, and Tien-Hao Huang, “Energy band structure tailoring of vertically aligned InAs/GaAsSb quantum dot structure for intermediate-band solar cell application by thermal annealing process” , Optics Express, 22(25), pp. 30963–30974, 2014 (Rank: 5/80, IF: 3.75, OPTICS - SCIE)

Jung-Y. Huang, Chien-Y. Lin, Wei-Sheng Liu, and Jen-Inn Chyi, “Quantum control study of ultrafast optical responses in semiconductor quantum dot devices” Optics Express, 22(25), pp.30815-30825, 2014 (Rank: 5/80, IF: 3.75, OPTICS - SCIE)

Wei-Sheng Liu*, Shen-Yu Wu, Chao-Yu Hung, Ching-Hsuan Tseng, and Yu-Lin Chang, “Improving the Optoelectronic Properties of Gallium ZnO Transparent Conductive Thin Films through Titanium Doping”, Journal of Alloys and Compounds, 616, 268-274, 2014. (Rank: 4/76, IF: 4.18, SCI,EI)

Wei-Sheng Liu*, and Ching-Min Chang, “Capping InAs Quantum Dots with an InGaAsSb Strain-Reducing Layer to Improve Optical Properties and Dot-Size Uniformity”, Thin Solid Film, 570, 490-495, 2014 (Rank: 5/17, IF: 1.935, SCI, EI)

Wei-Sheng Liu*, Shen-Yu Wu, Ching-Hsuan Tseng, and Chao-Yu Hung, “Quality Improvement of High-performance Transparent Conductive Ti-Doped GaZnO Thin Film”, Thin Solid Film, 570, 568-573, 2014 (Rank: 5/17, IF: 1.935, SCI, EI)

Chih-Hao Chang*, Wei-Sheng Liu*, Shen-Yu Wu, Jun-Lin Huang, Chao-Yu Hung, Yu-Lin Chang, Ying-Chieh Wu, Wei-Chih Chen and Yi-Cheng Wu, “Ga-doped TiZnO Transparent Conductive Oxide used as an alternate anode in blue, green, and red phosphorescent OLEDs”, Physical Chemistry Chemical Physics, 16, 19618-19624, 2014 (Rank: 5/33, IF: 4.49, SCI,EI)

Wei-Sheng Liu*, Hsin-Lun Tseng, and Po-Chen Kuo, “Enhancing optical characteristics of InAs/InGaAsSb quantum dot structures with long-excited state emission at 1.31 μm”, Optics Express, 22(16), pp. 18860-18869, 2014 (Rank: 5/80, IF: 3.75, OPTICS - SCIE)

Wei-Sheng Liu*, W.-K. Chen, S.-Y. Wu, and K.-P. Hsueh, “Improved Crystal Quality of Transparent Conductive Ga-doped ZnO Films by Magnesium Doping Through Radio-Frequency Magnetron Sputtering Preparation” Journal of the American Ceramic Society, 97, 473-480, 2014. (Rank: 1/25, IF: 2.841, SCI,EI)

Wei-Sheng Liu*, S.-Y. Wu, C.-H. Tseng, and C.-Y. Hung, “Development of high-quality titanium-doped gallium ZnO transparent conductive films by RF magnetron sputtering techniques” Physica Status Solidi C, 10, 1569, 2013 (EI)

Wei-Sheng Liu*, Y.-T. Wang, C.-M. Chang, W.-Y. Qiu, and C. Fang, “Study of carry dynamics of vertically aligned InAs/GaAsSb quantum dot structures” Physica Status Solidi C, 10, 1489, 2013 (EI)

Wei-Sheng Liu*, Yen-Ting Wang, Wen-Yu Qiu, and Chi Fang, “Carrier Dynamics of a Type-II Vertically Aligned InAs Quantum Dot Structure with a GaAsSb Strain-Reducing Layer” Appl. Phys. Express, 6, 085001, 2013. (Rank: 22/127, IF: 2.57, SCI,EI)

Wei-Sheng Liu*, “Enhancing device characteristics of 1.3 μm emitting InAs/GaAs quantum dot lasers through dot-height uniformity study”, Journal of Alloys and Compounds 571, 153-158, 2013. (Rank: 4/76, IF: 4.18,SCI,EI)

Wei-Sheng Liu*, Y.-H. Liu, W.-K. Chen and K.-P. Hsueh, “Transparent Conductive Ga-doped MgZnO/Ag/ Ga-doped MgZnO Sandwich Structure with improved conductivity and transmittance”, Journal of Alloys and Compounds, 564, 105-113, 2013 (Rank:4/76, IF: 4.18 ,SCI, EI)

Wei-Sheng Liu*, Wei-Ku Chen, Kuang-Po Hsueh, “Transparent conductive Ga-doped MgxZn1−xO films with high optical transmittance prepared by radio frequency magnetron sputtering”, Journal of Alloys and Compounds, 552, 255-263, 2013(Rank:4/76, IF: 4.18, SCI, EI)

Wei-Sheng Liu*,Hong-Ming Wu, Fu-Hsiang Tsao, Tsan-Lin Hsu, Jen-Inn Chyi, "Improving the characteristics of intermediate-band solar cell devices using a vertically aligned InAs/GaAsSb quantum dot structure", Solar Energy Materials and Solar Cells, 105, 237–241, 2012(Rank:28/251, IF: 5.337,SCI, EI)

Wei-Sheng Liu*, Hsin-Lun Tseng, Tien-Hao Huang, Ting-Fu Chu, Po-Chen Kuo, Fu-Hsiang Tsao, and Jen-Inn Chyi “Characteristic improvements of vertically aligned columnar quantum dot solar cell with a GaAsSb capping layer”, Proceedings of SPIE (Proc. SPIE), Vol. 8471, pp. 21, 2012. (EI)

Wei-Sheng Liu*, H.-M. Wu, Y.-A. Liao, J.-I. Chyi, W.-Y. Chen, and T.-M. Hsu, “High Optical Property Vertically Aligned InAs Quantum Dot Structures with GaAsSb Overgrown Layers”, J. Cryst. Growth, 323, 164, 2011. (Rank:81/232, IF: 1.726, SCI, EI)

Hsueh, K.-P., Cheng, Y.-C., Lin, W.-Y., Chiu, H.-C., Huang, Y.-P., Chi, G.-C., Liu, W.-S., “Physical properties of Al-doped MgZnO film grown by RF magnetron sputtering using ZnO/MgO/Al 2O 3 target”, Proceedings of SPIE - The International Society for Optical Engineering, 8110, September 13, 2011. (EI)

D.-C. Wu, Y.-C. Un, M.-H. Mao, W.-S. Liu, P.-C. Chiu, J.-I. Chyi, J.-S. Wang, G. Lin, J.-Y. Chi, “Temperature dependences of quantum-dot laser thresholds under simultaneously three-state or two-state lasing operations”, Conference on Quantum Electronics and Laser Science Conference on Lasers and Electro-Optics, CLEO/QELS, 2008 (EI)

J.-I. Chyi*, W.-S. Liu, P.-C Chiu, M.-J Shiau, David M.-T Kuo, W.-Y. Chen, H.-S. Chang, and T. M. Hsu, “High Quality InAs Quantum Dots with an In(Ga, Al)AsSb Strain-Reducing Layer for Long Wavelength Photonic Devices”, ECS Trans.6 (2), 35-40, May, 2007. (NSC 94-2215-E-008-004, 94-2752-E-008-001-PAE, and 93-2120-M-008-001)(EI)

Chiu, P.-C., Liu, W.-S., Shiau, M.-J., Chyi, J.-I., Chen, W.-Y., Chang, H.-S., Hsu, T.-M., “High optical quality of InAs quantum dots with an InAlAsSb strain-reducing layer”, Conference Proceedings - International Conference on Indium Phosphide and Related Materials, 2007. (EI)

Y.-T. Li, J.-W. Shi*, C.-L. Pan, C.-H. Chiu, W.- S. Liu, N.-W. Chen, C.-K. Sun, and J.-I. Chyi, “Sub-THz Photonic - Transmitters Based on Separated -Transport- Recombination Photodiodes and a Micromachined Slot Antenna”, IEEE Photon. Tech, Lett. 19, 840-842, June, 2007. (Rank:42/245,SCI, EI)

J.-S. Hwang*, H.-C. Lin, C.-K. Chang, T.-S. Wang, L.-S. Chang, J.-I. Chyi, W.-S. Liu, S.-H. Chen, H.-H. Lin and P.-W. Liu, “The dependence of terahertz radiation on the built-in electric field in semiconductor microstructures”, Opt. Express 15, 5120-5125, April, 2007. (Rank:6/79, SCI, EI)

P.-C Chiu, W.-S. Liu, M.-J Shiau, J.-I. Chyi*, W.-Y. Chen, H.-S. Chang, and T. M. Hsu, “Enhancing the optical properties of InAs quantum dots by an InAlAsSb overgrown layer”, Appl. Phys. Lett. 91, 153106, Oct., 2007. (Rank:17/125,SCI, EI)

W.-S. Liu, David M.-T Kuo, J.-I. Chyi*, W.-Y. Chen, H.-S. Chang, and T. M. Hsu, “Enhanced thermal stability and emission intensity of InAs quantum dots covered by InGaAsSb strain-reducing layer”, Appl. Phys. Lett., 89, 243103, Dec., 2006. (Rank:17/125,SCI, EI)

W.-S. Liu, H. Chang, Y.-S. Liu, and J.-I. Chyi*, “Pinhole-Like Defects in Multi-Stack 1.3 mm InAs Quantum Dot Laser”, J. Appl. Phys., 99, 114514, June, 2006. (NSC 94-2215-E-008-004) (Rank:37/125,SCI, EI)

T.-F. Kao, H.-H. Chang, L.-J. Chen, J.-Y. Lu, A.-S. Liu, Y.-C. Yu, R.-B. Wu, W.-S. Liu, J.-I. Chyi, and C.-K. Sun*, “Frequency tunability of terahertz photonic transmitters”, Appl. Phys. Lett. 88, 093501, Feb., 2006. (Rank:17/125,SCI, EI)

J.-W. Shi*, Y.-T. Li, M.-L. Lin, Y.-S. Wu, W.-S. Liu, J.-I. Chyi , and C.-L. Pan, “Bandwidth Enhancement Phenomenon of a High-Speed GaAs-AlGaAs Based Unitraveling Carrier Photodiode with an Optimally Designed Absorption-Layer at an 830 nm Wavelength”, Appl. Phys. Lett. 89, 053512, Aug., 2006. (Rank:17/125,SCI, EI)

J.-Y. Lu, L.-J. Chen, T.-F. Kao, H.-H. Chang, C.-K. Sun, A-S. Liu, Y.-C. Yu, R.-B. Wu, W.-S. Liu, J.-I. Chyi, “Terahertz biochip for illicit drug detection”, Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, CLEO/QELS 2006 (EI)

J.-W. Shi, Y.-T. Li, C.-L. Pan, M.-L. Lin, Y.-S. Wu, W.-S. Liu, J.-I. Chyi, “Separated-transport-recombination p-i-n photodiode (STR-PD) with high-speed and high-power performance under Continuous-Wave (CW)”, Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, CLEO/QELS 2006 (EI)

T.-F. Kao, L.-J. Chen, H.-H. Chang, J.-Y. Lu, A.-S. Liu, Y.-C. Yu, R.-B. Wu, W.-S. Liu, J.-I. Chyi, C.-K. Sun, “Broadband-response and frequency-tunable terahertz photonic transmitters with high efficiency”, Optics InfoBase Conference Papers (EI) 2006

J.-Y. Lu, L.-J. Chen, T.-F. Kao, H.-H. Chang, H.-W. Chen, A.-S. Liu, Y.-C. Chen, R.-B. Wu, W.-S. Liu, J.-I. Chyi , and C.-K. Sun*, “Terahertz Microchip for Illicit Drug Detection”, IEEE Photonics Technology Letters, 18, 2254-2256, 2006 (NSC 94-2215-E-002-007) (Rank:42/245,SCI, EI)

J.-W. Shi*, H.-C. Hsu, F.-H. Huang, W. -S. Liu, J.-I. Chyi, J.-Y. Lu, C.-K. Sun, and C.-L. Pan, “Separated-Transport-Recombination p-i-n Photodiode for High-Speed and High-Power Performance”, IEEE Photonics Technology Letters, Vol.17, 1722-1724, Aug., 2005. (NSC 92-2218-E-008-011, and 93-2215-E-008-022) (Rank:42/245,SCI, EI)

Lu, J.-Y., Chen, L.-J., Kao, T.-F., Chang, H.-H., Liu, A.-S., Yu, Y.-C., Wu, R.-B., Liu, W.-S., Chyi, J.-I., Pan, C.-L., Tsai, M.-C., Sun, C.-K., “Terahertz biochip based on optoelectronic devices”, Proceedings of SPIE - The International Society for Optical Engineering, 2005 (EI)

W.-S. Liu, Holin Chang, and J.-I. Chyi, “Effects of dot-height uniformity on the performance of 1.3 um InAs quantum dot lasers”, 5th IEEE Conference on Nanotechnology, 2005. (EI)

W.-S. Liu, and J.-I. Chyi*, “Optical Properties of InAs Quantum Dots with InAlAs/InGaAs Composite Matrix”, J. Appl. Phys. Vol.97, 024312-024314, Jan. 2005. (NSC 91-2120-E-008-001) (Rank:37/125,SCI, EI)

J.-I. Chyi , W.-S. Liu, T.-P. Hsieh, T. M. Hsu, W. H. Chang, W. Y. Chen and H. S. Chang, “Progress on InAs-Based Quantum Dot Light Emitters”, 208 th Meeting of the Electrochemical Society (ECS), Los Angeles, U.S.A., 2005. (EI)

T.-F. Kao, L.-J. Chen, H.-H. Chang, J.-Y. Lu, A.-S. Liu, Y.-C. Yu, R.-B. Wu, W.-S. Liu, J.-I. Chyi, C.-K. Sun, “Broadband-response and frequency-tunable terahertz photonic transmitters with high efficiency”, IEEE Conference on Lasers and Electro-Optics, Baltimore, U.S.A., 2005 (EI)

W.-S. Liu, and J.-I. Chyi, “Optical properties of InAs quantum dots with InAlAs/InGaAs composite matrix”, 16th Intl. Conf. InP Related Materials, Kagoshima, Japan, 2004 (EI)

L. Jiang, S.-S. Li*, W.-S. Liu, N.-T. Yeh and J.-I. Chyi, “A Two-Stack, Multi-Color In_0.5Ga_0.5As/GaAs and InAs/GaAs Quantum Dot Infrared Photodetector for Long Wavelength Infrared Detection”, Infrared Physics and Technology, Vol.46, 249-256, Jan., 2005. (NSC 91-2120-E-008-001) (SCI, EI)

H.-C. Chiu, S.-C. Yang, Y.-J. Chan*, S.-H. Chen, W.-S. Liu and J.-I. Chyi,” The microwave power performance comparisons of Al_xGa_1-xAs/In_0.15Ga_0.85As (x=0.3, 0.5, 0.7, 1.0) doped-channel HFETs”, Electron Devices, Vol. 51, 156 – 158, Jan. 2004. (NSC 90-2219-E-008-003) (SCI, EI)

M.-C. Tien, H.-H. Chang, J.-Y. Lu, L.-J. Chen, S.-Y. Chen, R.-B. Wu, W.-S. Liu, J.-I Chyi and C.-K. Sun*, “Device saturation behavior of submillimeter-wave membrane photonic transmitters”, IEEE Photonics Technology Letters, Vol. 16, 873 – 875, March, 2004. (Rank:42/245,SCI, EI)

C.-K. Sun, M.-C. Tien, H.-H. Chang, J.-Y. Lu, L.-J. Chen, S.-Y. Chen, R.-B. Wu, W.-S. Liu, J.-I. Chyi, “Conversion efficiency and device behavior of edge-coupled membrane photonic transmitters”, Lasers and Electro-Optics Society, LEOS, 2003 (EI)

N.-T. Yeh, W.-S. Liu, S.-H. Chen, P.-C. Chiu, and J.-I. Chyi*, “InAs/GaAs quantum dot lasers with InGap cladding layer grown by solid-source molecular-beam epitaxy”, Appl. Phys. Lett. 80, 4, 535-537, Jan., 2002. (Rank:17/125,SCI, EI)

N.-T. Yeh, W.-S. Liu, S.-H. Chen, J.-I. Chyi, “Effects of spacer thickness on the performance of InGaAs/GaAs quantum dot lasers”, Materials Research Society Symposium – Proceedings, 2001 (EI)

N.-T. Yeh, W.-S. Liu, S.-H. Chen, P.-J. Chiu, J.-I. Chyi, “InAs/GaAs quantum dot lasers with InGaP cladding layer grown by solid-source molecular beam epitaxy”, Conference Proceedings - International Conference on Indium Phosphide and Related Materials, 2001 (EI)

 Conference:

1. Wei-Sheng Liu*, Kuo-Jui Hu, Jiun-Yi Ye, Deveshwar Sasikumar, Balaji Gururajan, "Reactive Pulsed-DC Sputtered GaN Thin Films on Si for Lateral Schottky Barrier Ultraviolet Photodetectors", IUMRS 2026, Tainan, Taiwan.
2. Deveshwar Sasikumar, Venkatesh Narasihman, Wei-Sheng Liu*, Balaji Gururajan*, "Structural, Optical, and Electronic Property Modulation of ZnGa₂O₄ Thin Films via Sequential RF Magnetron Sputtering", IUMRS 2026, Tainan, Taiwan.
3. Kuan-Ting Shih, Wei-Sheng Liu*, Bhavya Kondapavuluri, Zhi-Han Lin, Deng-Yi Shen, Jen-Inn Chyi, "Optical Emission Tuning of InAs Quantum Dots on GaAs Substrates Using Al-Containing InAlGaAs Strain-Reducing Layers for Silicon Photonics", IUMRS 2026, Tainan, Taiwan.
4. Bhavya Kondapavuluri, Wei-Sheng Liu*, Zhi-Han Lin, Kuan-Ting Shih, Jen-Inn Chyi, "Kinetic Control of Ultralow-Density InAs Quantum Dot Formation by Molecular Beam Epitaxy for Single-Photon Emitters", IUMRS 2026, Tainan, Taiwan.
5. Wei-Sheng Liu*, Chun-Bin Hsu, Guan-Ru Chen, Bing-Yu Wu, Yen-Wei Chan, "Oxygen-Vacancy-Related Defect Suppression and Improved Subthreshold Characteristics in Hafnium-Doped ITZO Thin-Film Transistors", International Electron Devices and Materials Symposium (IEDMS) 2026, Taipei, Taiwan.
6. Wei-Sheng Liu*, Bhavya Kondapavuluri, Min-Jie Chang, Ting-Wei Wu, Min-Chen Yu, Jen-Inn Chyi, "Interface Engineering of InAs/InAsSb Type-II Superlattices Grown by Molecular Beam Epitaxy", International Electron Devices and Materials Symposium (IEDMS) 2026, Taipei, Taiwan.
7. Kuo-Jui Hu, Wei-Sheng Liu*, Jiun-Yi Ye, "Modulating Growth Kinetics in Pulsed-Sputtered GaN-on-Si for High-Performance UV Photodetectors", Symposium on Nano Device Circuit Technology (SNDCT) 2026, Hsinchu, Taiwan.
8. Deveshwar Sasikumar, Venkatesh Narasihman, Balaji Gururajan*, Wei-Sheng Liu*, "Tailoring the Structural Disorder and Optoelectronic Properties of ZnGa₂O₄ via Sputtering Kinetics", Symposium on Nano Device Circuit Technology (SNDCT) 2026, Hsinchu, Taiwan.
9. Bhavya Kondapavuluri, Kai-Yang Hsu, Wei-Sheng Liu*, Zhi-Han Lin, Kuan-Ting Shih, Deng-Yi Shen, Jen-Inn Chyi, "Epitaxial Growth of High-Density InAs/InGaAs Quantum Dots on GaAs Substrates for 1.3 μm O-Band Co-Packaged Optics", Symposium on Nano Device Circuit Technology (SNDCT) 2026, Hsinchu, Taiwan.
10. Chen-Hung Chien, Wei-Sheng Liu, "High-Frequency Figure-of-Merit Optimization in Trench SiC Power MOSFETs via a Deeply Buried P-Shield Design", Symposium on Nano Device Circuit Technology (SNDCT) 2026, Hsinchu, Taiwan.
11. Bhavya Kondapavuluri, Wei-Sheng Liu*, Yung-Jyun Liao, Balaji Gururajan, Jen-Inn Chyi, “Effect of Epitaxial Growth Temperature on Interfacial and Optical Quality in InAs/GaSb Type-II Superlattices” Compound Semiconductor Week (CSW) 2026, Kumamoto, Japan
12. Deveshwar Sasikumar, Venkatesh Narasihman, Wei-Sheng Liu*, Balaji Gururajan* “Sequential RF Sputtering Enabled Zn Incorporation and Spinel Formation in Ga₂O₃ Thin Films”, Compound Semiconductor Week (CSW) 2026, Kumamoto, Japan.
13. Balaji Gururajan, Deveshwar Sasikumar, Venkatesh Narasihaman, Zin Thu Thu Naing, Kaviya Palanisamy, Wei-Sheng Liu, Prasanna Sankaran, Watcharapan Suansantisuk, “Data Driven Simulation Framework for High-Performance BaZrS2 Pervoskite Solar Cells”, 14^th Joint Conference on Renewable Energy and Nanotechnologh, NCU, Taiwan, 2025 - Best Poster Award
14. Wei-Sheng Liu*, Guan-Ru Chen, Chun-Bin Hsu, Bing-Yu Wu, Swetha Sathiskumar, Balaji G., “Improved Stability and Electrical Performance in Nitrogen-Doped ITZO Thin-Film Transistors”, Optics & Photonics Taiwan, International Conference, Taiwan, 2025
15. Deveshwar Sasikumar, Venkatesh Narasihman, Balaji Gururajan*, Wei Sheng Liu*, Sheng Hsiang Kao, Ting Rui Hsu, “RF-Sputtered β-Ga2O3 Thin Films for Enhanced High-Energy X-ray Sensing Applications”, Optics & Photonics Taiwan, International Conference, Taiwan, 2025
16. Deveshwar Sasikumar, Venkatesh Narasihman, Balaji Gururajan, Wei Sheng Liu*, Sheng Hsiang Kao, Ting Rui Hsu, “High-Energy X-ray Sensing with β-Ga2O3 Thin Films Grown by RF Magnetron Sputtering”, Taiwan Association for Coating and Thin Film Technology, 2025
17. Wei-Sheng Liu*, Guan-Ru Chen, Chun-Bin Hsu, Bing-Yu Wu, Swetha Sathiskumar, Balaji G., “Nitrogen-Doped ITZO Thin-Film Transistors with Enhanced Electrical Performance and Stability”, Taiwan Association for Coating and Thin Film Technology, 2025
18. Wei-Sheng Liu*, Guan-Ru Chen, Chun-Bin Hsu, Bing-Yu Wu, Swetha Sathiskumar, Balaji G., “Enhanced Stability and Performance of ITZO Thin-Film Transistors through In-Situ Nitrogen Doping during RF Sputtering”, Taiwan Vacuum Society, Taiwan, 2025
19. Wei-Sheng Liu*, Deveshwar Sasikumar, Venkatesh Narasihman, Balaji Gururajan, Sheng Hsiang Kao, Ting Rui Hsu, “RF Magnetron Sputtered β-Ga₂O₃ Thin Films for High-Energy X-ray Sensing”, Taiwan Vacuum Society, Taiwan, 2025 - Oral Award
20. Deveshwar Sasikumara; Venkatesh Narasihman; Balaji Gururajan*; Wei-Sheng Liu*; Sheng Hsiang Kao; Ting-Rui Hsu, “Optimized β-Ga2O3/IGZO Heterostructure for High-Energy X-ray Detection via RF Magnetron Sputtering”, Smart Devices and Sustainable Energy (SDSE 2025), Taiwan, 2025
21. Wei-Sheng Liu*, Guan-Ru Chen, Chun-Bin Hsu, Bing-Yu Wu, Swetha Sathiskumar, and Balaji G., “Enhanced Electrical Performance and Operation Stability of Nitrogen-Doped Indium–Tin–Zinc Oxide Thin-Film Transistors”, International Electron Devices & Materials Symposium, IEDMS, Taiwan, 2025
22. Bhavya. K, Kai-Yang Hsu, Pin-Chih Liu, Wei-Sheng Liu*, Balaji. G and Jen-Inn Chyi, “Optical and Structural Investigations of Antimonide-Exposed InAs/GaAs Quantum Dots in an InGaAs Quantum Well Matrix for 1380 nm Photoluminescent Emission”, 39th North American Conference on Molecular Beam Epitaxy (NAMBE 2025), New Mexico, USA, 2025
23. Hsiang-You Cheng¹, Yung-Jyun Liao², Pin-Chih Liu², Hou-Yi Chen², Wei-Sheng Liu², and Jen-Inn Chyi^1*, “Extending the Emission Wavelength of InAs Quantum Dots on GaAs up to 1405 nm by Antimony Incorporation Engineering”, Compound Semiconductor Week (CSW) 2025, Banff, Alberta, Canada.
24. Sheng-Hsiang Kao, Ting-Rui Hsu, Balaji. G, Venkatesh. N, Deveshwar, Wei-Sheng Liu*, “Effect of High-Temperature Thermal Annealing on the Properties of β-Ga₂O₃ Thin Films Prepared by RF Magnetron Sputtering”, International Electron Devices & Materials Symposium, IEDMS, Taiwan, 2024
25. Li-Cheng Huang, Wei-Sheng Liu*, Kuo-Jui Hu, Jiun-Yi Ye, “Optimizing the high-quality c-axis GaN thin film using DC-Pulsed Reactive Sputtering”, Optics & Photonics Taiwan, International Conference (OPTIC 2024), Taiwan, 2024
26. Sheng-Hsiang Kao, Ting-Rui Hsu, Balaji. G, Venkatesh. N, Deveshwar, Wei-Sheng Liu*, “Effects of Sputtering Temperature on β-Ga₂O₃-Based Deep UV Detector Prepared by RF Magnetron Sputtering”, Optics & Photonics Taiwan, International Conference (OPTIC 2024), Taiwan, 2024 - Best Student Paper Award
27. Hou-Yi Chen, Yung-Jyun Liao, Balaji. G, Pin-Chih Liu, Jhih-Han Lin, Bhavya. K , Min-Jie Zhang ,Wei Sheng Liu*, Jen-Inn Chyi, “Investigation of Growth Temperature Effects on Strain and Defects in InAs/GaSb Type-II Superlattice Structures”, Optics & Photonics Taiwan, International Conference (OPTIC 2024), Taiwan, 2024
28. Yun-Jui Yeh, Yu-En Chen, Bhavya. K, Tsung-An Yang, Sindu Gnanam A B, Sriranjani S, Balaji. G, Wei-Sheng Liu*, “Influence of Sputtering Power on the Crystalline Structure and Optoelectronic Properties of P-type CuCrO₂ Thin Films”, Optics & Photonics Taiwan, International Conference (OPTIC 2024), Taiwan, 2024
29. Yu-En Chen, Yun-Jui Yeh, Bhavya. K, Tsung-An Yang, Sindu Gnanam A B, Sriranjani S, Balaji. G, Wei-Sheng Liu*, “Effect of Total Gas Flow Rate on the Optoelectronic Properties of CuCrO₂ Thin Films and Investigation of Transparent p-n Heterojunction Diode Characteristics”, Smart Devices and Sustainable Energy (SDSE 2024), Taiwan, 2024
30. Jhih-Han Lin , Pin-Chih Liu , Bhavya. K , Yung-Jyun Liao , Hou-Yi Chen , Min-Jie Zhang , Hsiang You Cheng, Wei-Sheng Liu*, Jen-Inn Chyi, “Optical and Structural Effects of Sb-containing InAs/InGaAs Quantum Dots for 1.38 μm Wavelength Emission on GaAs Substrates”, Smart Devices and Sustainable Energy (SDSE 2024), Taiwan, 2024
31. Yun-Jui Yeh, Yu-En Chen, Bhavya. K, Tsung-An Yang, Sindu Gnanam A B, Sriranjani S, Balaji. G, Wei-Sheng Liu*, “Optimization of CuCrO₂ Thin Films for UV Detection: Effects of RF Sputtering Power on Structural, Optical, and Electrical Properties”, Smart Devices and Sustainable Energy (SDSE 2024), Taiwan, 2024
32. Sheng-Hsiang Kao, Ting-Rui Hsu, Balaji. G, Venkatesh. N, Deveshwar, Wei-Sheng Liu*, “Influence of Oxygen Flow Rate on Structural, Optical, and Morphological Properties of β-Ga₂O₃ Thin Films”, Taiwan Association for Coating and Thin Film Technology (TACT 2024) , Taiwan, 2024 – 口頭論文競賽佳作
33. Bhavya. K, Kai-Yang Hsu, Pin-Chih Liu, Wei-Sheng Liu*, Balaji. G, Jen-Inn Chyi, “InAs Quanutm Dotswith emission Wavelength of 1.38 µm Grown by Molecular Beam Epitaxy on GaAs Substrates”, Compound Semiconductor Week (CSW) 2024, Lund University, Sweden.
34. Charles W. Tu, Zhen-Lun Li, Zon, Tzu-Wei Lo, Chun-Nien Liu, Chun-De Chiang, Li-Wei Hung, Ming-Sen Hsu, Wei-Sheng Liu, Jen-Inn Chyi, Chao-Jia Cheng, “Bandgap engineering of GaAsSb/InGaAs MQW with and without strain compensation for 1 μm”, Optics & Photonics Taiwan, International Conference (OPTIC 2023), Taiwan, 2023
35. Yung-Jyun Liao, Hou-Yi Chen, Balaji Gururajan, Pin-Chih Liu, Wei-Sheng Liu*,Jen-Inn Chyi, “Impact of V/III Ratio for the InAs Layer in the SWIR Type-II Superlattices Grown by Molecular Beam Epitaxy”, Optics & Photonics Taiwan, International Conference (OPTIC 2023), Taiwan, 2023
36. Pin-Chih Liu, Kai-Yang Hsu, Bhavya Kondapavuluri, Jhih-Han Lin, Hou-Yi Chen, Balaji Gururajan, Wei-Sheng Liu*, Jen-Inn Chyi, “InAs Quantum Dots with Emission Wavelength of 1.38 μm Grown by Molecular Beam Epitaxy on GaAs Substrates”, Optics & Photonics Taiwan, International Conference (OPTIC 2023), Taiwan, 2023
37. Li-Cheng Huang, Wei-Sheng Liu*, Balaji Gururajan, Kuo-Jui Hu, Guo-Hong Shen, “Growth and Characterization of GaN Thin Films on Si Substrates with AlN Buffer Layer and RF Sputtering”, Optics & Photonics Taiwan, International Conference (OPTIC 2023), Taiwan, 2023
38. Li-Cheng Huang, Wei-Sheng Liu*, Balaji Gururajan, Kuo-Jui Hu, Guo-Hong Shen, “Deposition and Optimization of High-Quality GaN Thin Films on Glass Substrates through RF Magnetron Sputtering” Optics & Photonics Taiwan, International Conference (OPTIC 2023), Taiwan, 2023
39. Yun-Jui Yeh, Yu-En Chen, Bhavya Kondapavuluri, Tsung-An Yang, Sindu Gnanam A B, Sriranjani SIVASUBRAMANIAN, Balaji Gururajan, Wei-Sheng Liu*, “Effect of deposition pressure on the optoelectronic characteristics of p-type Cu-doped CrO2 thin films”, Optics & Photonics Taiwan, International Conference (OPTIC 2023), Taiwan, 2023
40. Yu-En Chen, Yun-Jui Yeh, Tsung-An Yang, Bhavya Kondapavuluri, Sindu Gnanan A. B., Sriranjani SIVASUBRAMANIAN, Balaji Gururajan, Wei-Sheng Liu*, “Investigating the Influence of Oxygen Flow Rate on the Optoelectronic Characteristics of P-Type Cu-Doped CrO2 Thin Films”, Optics & Photonics Taiwan, International Conference (OPTIC 2023), Taiwan, 2023
41. Shin-Yu Lai, Tzu-Chun Chen, Balaji Gururajan, Wei-Sheng Liu*, “Effect of NiO interlayer on the optical and the electrical properties in CuAlO2/NiO/CuAlO2 sandwich structure”, Optics & Photonics Taiwan, International Conference (OPTIC 2023), Taiwan, 2023
42. Balaji Gururajan*, Wei-Sheng Liu, Balasundaraprabhu R, Prasanna S, David Mcilroy, Elena Echeverria, “Exploring the role of sulfur induced sputtering targets for the fabrication of Cu2ZnSnS4 absorber layer based thin film solar cells”, Taiwan Association for Coating and Thin Film Technology 2023
43. Tzu-Wei Lo, Zon, Zhen-Lun Li, Chao-Chia Cheng, Chun-Nien Liu, Chun-De Chiang, Li-Wei Hung, Ming-Sen Hsu, Wei-Sheng Liu, Jen-Inn Chyi, Charles W. Tu, “X-ray Diffraction Studies on InGaAs/GaAsSb with and without GaAsP Straincompensating Layers”, International Electron Devices & Materials Symposium (IEDMS), Taiwan, 2023. (Best Poster Paper Award)
44. Tzu-Chun Chen, Balaji. G, Wei-Sheng Liu*, Kuo-Jui Hu, Fu-Wei Chiu, Jhih-Han Lin, “Studies on RF Magnetron sputtered FTO/n-ZnO/p-NiO/AgNW transparent solar cells devices”, International Workshop on Active-Matrix Flat Panel Displays and Devices, Kyoto, Japan, 2023
45. Samatcha Voranthamrong, Zon, Sau-Jia Cheng, Tzi-Wei Luo, Chen-Lun Lee, Chun-Nien Liu, Chun-De Chiang, Li-Wei Hung, Ming-Sen Hsu, Wei-Sheng Liu, Jen-Inn Chyi, and Charles W. Tu, “The Effects of Strain Compensation in Type-II InGaAs/GaAsSb Quantum Wells Grown on GaAs(001) Substrates”, 65th Electronic Materials Conference, UCLA, Santa Barbara, USA, 2023
46. Kai-Yang Hsu, Wei-Sheng Liu*, Yung-Jyun Liao, and Hou-Yi Chen “Effects of VIII ratios on Size Distribution and Density of InAs/InGaAs Quantum Dots on GaAs”, Optics & Photonics Taiwan, International Conference (OPTIC 2022), Taiwan, 2022
47. Yung-Jyun Liao, Wei-Sheng Liu*, Hou-Yi Chen, Pin-Chih Liu, Balaji. G, Kai-Yang Hsu, and Jen-Inn Chyi, “Optimization of the growth temperature and periods for improving the optical properties of SWIR Type-II super lattice for Infrared Photodetectors”, Optics & Photonics Taiwan, International Conference (OPTIC 2022), Taiwan, 2022
48. Shih-Chen Yu, Wei-Sheng Liu*, Po-I Lee and Ssu-Chin Tseng, “Study on CdS and ZnO as Buffer Layers for Solar Cells”, International Electron Devices & Materials Symposium (IEDMS), Taiwan, 2022
49. Tsun-Jie Ko, Jen-Inn Chyi, Wei-Sheng Liu, “High Quality InAs/GaSb Type II Superlattices Grown by Molecular Beam Epitaxy”, International Electron Devices & Materials Symposium (IEDMS), Taiwan, 2021
50. Yu-Jiang, Wei-Sheng Liu*, and Chih-Hao Hsu, “Improving device characteristics of dual-gate IGZO thin-film transistors with rapid thermal annealing process”, Optics & Photonics Taiwan, International Conference (OPTIC 2021), Taiwan, 2021
51. Yung-Jyun Liao, Wei-Sheng Liu*, Yang-Kai Hsu, Ming-En Hsu, “Insertion of InGaAs quantum well for improving the optical properties of InAs quantum dots with 1.3 μm emission” , Optics & Photonics Taiwan, International Conference (OPTIC 2021), Taiwan, 2021
52. Guan-Ru Chen, Wei-Sheng Liu*, Po-Hao Chang, G. Balaji, Tsun-Jie Ko, Ming-En Syu, and Jen-Inn Chyi, “Influence of growth temperature of InAs/GaSb Type II Superlattice Infrared Photodetector prepared using Molecular Beam Epitaxy”, Optics & Photonics Taiwan, International Conference (OPTIC 2021), Taiwan, 2021
53. Kai-Yang Hsu, Wei-Sheng Liu*, Ming-En Syu, Po-Hao Chang, Yung-jyun Liao, “Effects of indium composition of InGaAs quantum well on the optical properties of InAs/InGaAs dots-in-a-well structure”, Optics & Photonics Taiwan, International Conference (OPTIC 2021), Taiwan, 2021
54. Yung-Chen Li, Wei-Sheng Liu*, Balaji G, Ming-Hsuan Tsai, “Comparative studies of Zn(O:S) thin films by post sulphurization of RF sputtering- deposited ZnO layers”, Optics & Photonics Taiwan, International Conference (OPTIC 2021), Taiwan, 2021
55. Sui-Hua Wu, Wei-Sheng Liu*, Li-Cheng Huang, Chung-Kai Chi , Balaji G, Yu-Lun Jiang, “The effects of growth temperatures on the growth of high quality AlN (002) thin films on Si (111) substrate by RF magnetron sputtering”, Optics & Photonics Taiwan, International Conference (OPTIC 2021), Taiwan, 2021
56. Yu-Lun Jiang, Wei-Sheng Liu*, Sui-Hua Wu, Balaji G, Chung-Kai Chi, Li-Cheng Huang, “Effect of Nitrogen ratio on the Growth of High Quality AlN on Si<111> Substrate by RF Magnetron Sputtering”, Optics & Photonics Taiwan, International Conference (OPTIC 2021), Taiwan, 2021
57. Kai-Yang Hsu, Wei-Sheng Liu*, Po-Hao Chang, Tsun-Jie Ko, Ming-En Syu, and Jen-Inn Chyi, “Enhancement of Optical Properties of InAs/InSb/AlSb Type II superlattices by thermal annealing process”, Optics & Photonics Taiwan, International Conference (OPTIC 2020）, Taiwan, 2020
58. Yong-Zhen Li, Wei-Sheng Liu*, Ming-Hsuan Tsai, Po-Hao Chang, Hsu-Kai Yang, Ming-En Hsu, “Study of the optical properties of InAs sub-monolayer quantum dots in an InGaAs(Sb)/GaAsSb double quantum well structure”, Optics & Photonics Taiwan, International Conference(OPTIC 2020）, Taiwan, 2020
59. Po-Hao Chang, Wei-Sheng Liu*, Tsun-Jie Ko, Ming-En Syu , and Jen-Inn Chyi, “Development of an InAs/InSb/AlSb Type II Superlattice Short-Wavelength Infrared Photodetector”, Optics & Photonics Taiwan, International Conference(OPTIC 2020）, Taiwan, 2020
60. Ming-Hsuan Tsai, Wei-Sheng Liu*, Ming-En Hsu, and Yong-Zhen Li, “Optical properties of InAs sub-monolayer quantum dots with pentanary InAlGaAsSb capping layer”, Optics & Photonics Taiwan, International Conference(OPTIC 2020）, Taiwan, 2020
61. Yung-Jyun Liao, Wei-Sheng Liu*, Guan-Ru Chen, and Li-Cheng Huang, “Effects of antimony incorporation in the InAlAsSb capping layer for the optical properties of the InAs submonolayer quantum dots”, Optics & Photonics Taiwan, International Conference(OPTIC 2020）, Taiwan, 2020
62. Ming-En Hsu, Wei-Sheng Liu*, Ting-Kai Yan, “Investigation of the optical properties of the InAs submonolayer quantum dots with GaAs/GaAsSb hole trapping structure”, Optics & Photonics Taiwan, International Conference(OPTIC 2020）, Taiwan, 2020
63. Sui-Hua Wu, Wei-Sheng Liu*, Yu-Lun Jiang, Chung-Kai Chi, “Use of DC reactive magnetron sputtering to grow high-quality AlN on Si<111> substrate”, Optics & Photonics Taiwan, International Conference(OPTIC 2020）, Taiwan, 2020
64. Wei-Sheng Liu*, Yi-Ming Chu, Chih-Hao Hsu, Yu Jiang, Meng-Jung Chiang, Yi-Chun Lai, and Yen-Lin Chen, “The development of P-type transparent conductive tin monoxide thin-film transistors”, International Conference on Flexible and Printed Electronics 2019（ICFPE2019）, Taiwan, 2019
65. Chien-Sheng Huang, Wei-Sheng Liu*, Shih-Yuan Chen,and Ming-Yuan Lee, “Two steps method to prepared ZnS thin film by sulfurization of sputtering-deposited Zn thin film”, Optics & Photonics Taiwan, International Conference(OPTIC2019）, Taiwan, 2019
66. Ming-Yuan Lee, Wei-Sheng Liu*, Shih-Yuan Chen,and Chien-Sheng Huang, “Studying on the characteristics of CZTS thin-film by sputtering deposition”, Optics & Photonics Taiwan, International Conference(OPTIC2019）, Taiwan, 2019
67. Wei-Sheng Liu*, Yu-Lin Chang, Cheng-Ting Tsai, and Chun-Yuan Tan, “Characteristics of Mg-Cu co-doped p-type GaN Film Deposited on Glass Substrate”, Optics & Photonics Taiwan, International Conference(OPTIC2019）, Taiwan, 2019
68. Wei-Sheng Liu*, Yi-Ming Chu, Chih-Hao Hsu, Yu Jiang, Meng-Jung Chiang, Yi-Chun Lai, and Yen-Lin Chen, “Fabrication of a double-gate p-type SnO TFT to improve transistor characteristics”, Optics & Photonics Taiwan, International Conference(OPTIC2019）, Taiwan, 2019
69. Wei-Sheng Liu*,Ting-Kai Yang,Yi-Miao Hua,Kai-Chun Ma,and Jen-Inn Chyi, “Investigation of InAs submonolayer quantum-dot solar cell with InGaAs/GaAsSb dot-in-a-double-well structure”, Optics & Photonics Taiwan, International Conference(OPTIC2019）, Taiwan, 2019
70. Wei-Sheng Liu*, Chun-Yuan Tan, Yu-Lin Chang, and Cheng-Ting Tsai, “Fabrication of N-type GaN thin film through Si and Ti co-doping on a glass substrate by using magnetron sputtering system”, International Conference on Advanced Technology Innovation 2019 (ICATI2019), Oral presentation, Sapporo, Hokkaido, Japan, 2019
71. Wei-Sheng Liu*, Chun-Yuan Tan, Yu-Lin Chang, and Cheng-Ting Tsai, “Development of n-type GaN film by Si and Ti co-sputtering technique on a glass substrate”, Compound Semiconductor Week 2019 (CSW2019), Nara, Japan, 2019
72. Wei-Sheng Liu*, Ting-Kai Yang, Jen-Inn Chyi, Po-hao Chang and Ming-En Hsu, “Enhanced optical properties of InAs submonolayer quantum dots in InGaAs/GaAsSb double-well cladding structure, 201905”, Epi-Taiwan Conference 2019, Taoyuan, Taiwan 2019
73. Wei-Sheng Liu*, Yu-Lin Chang, “Si-Sn co-doping n- type GaN film on the glass substrate by Sputtering Deposition system”, Optics & Photonics Taiwan, International Conference(OPTIC) 2018
74. Wei-Sheng Liu*, Cheng-Ting Tsai, Yu-Lin Chang, and Chun-Yuan Tan, “Deposition of p-type GaN thin films with Mg and Zn co-sputtering technique on glass substrates”, Optics & Photonics Taiwan, International Conference(OPTIC) 2018
75. Wei-Sheng Liu*, Ting-Kai Yang, and Jen-Inn Chyi, “The optical properties of InAs submonolayer quantum dots with GaAsSb capping layer”, Optics & Photonics Taiwan, International Conference (OPTIC) 2018
76. Wei-Sheng Liu*, Chun-Yuan Tan, Yu-Lin Chang, and Cheng-Ting Tsai, “Sputtering Deposition of an N-type GaN thin film with Si and Ti co-doping on a glass substrate”, Optics & Photonics Taiwan, International Conference (OPTIC) 2018
77. Wei-Sheng Liu*, Hui-Yu Chen, and Yu-Lin Chang, “Mg/Cu co-doped p-type GaN thin film on glass substrate by using co-sputtering deposition technique”, Optics & Photonics Taiwan, International Conference (OPTIC) 2018
78. Wei-Sheng Liu*, Shih-Yuan Chen,Chien-Sheng Huang, and Hsin-Hui Wang, “Effect of Zn composition in Cu2ZnSnS4 thin films with optimum sulfide annealing time”, Taiwan Vacuum Society (TVS), Taiwan, 2018
79. Wei-Sheng Liu*, Shao-Yang Lin, and Ting-Kai Yang, “Optical characteristics of InGaAs quantum dots grown on GaAsSb strain buffer layer”, Taiwan Vacuum Society (TVS), Taiwan, 2018
80. Wei-Sheng Liu*, Yi-Ming Chu, Chih-Hao Hsu, and Yu Jiang, “Sputtering P-type Tin monoxide film at different annealing temperatures and Ar/O2 gas ratios”, Taiwan Vacuum Society (TVS), Taiwan, 2018
81. Wei-Sheng Liu*, Yi-Hung Lin, Chien-Lung Huang, Chih-Wei Wang, Yi-Ming Chu, and Chih-Hao Hsu “Device Performance Improvement of Thin Film Transistor with Ti-Doped GaZnO / InGaZnO / Ti-Doped GaZnO Sandwich Composite Channel”, 45th International Symposium on Compound Semiconductors- ISCS, Boston, USA, 2018
82. Wei-Sheng Liu*, Shao-Yang Lin, Ren-Yo Liu, and Hsiao-Chien Lin “Vertical Arrangement of InGaAs / GaAs (Sb) Quantum Dots with AlGaAsSb Insertion Layer in Solar Cell Device”, 45th International Symposium on Compound Semiconductors- ISCS, Boston, USA, 2018
83. Wei-Sheng Liu*; Yu-Lin Chang; Hui-Yu Chen” Growth of Gallium Nitride Thin Film on Amorphous Glass Substrate Through Pulsed Direct Current Sputtering Deposition”, 45th International Symposium on Compound Semiconductors- ISCS, Boston, USA, 2018
84. Wei-Sheng Liu*, Wei-Ting Hsieh, Shih-Yuan Chen, Chien-Sheng Huang and Ting-Kai Yang, “Application of high-performance Ti-doped GaZnO transparent conducting thin films on CIGS solar cells”, Optics & Photonics Taiwan, the International Conference (OPTIC), Taiwan, 2017- Student Paper Award （學生論文獎）
85. Wei-Sheng Liu*, Chih-Wei Wang, Yi-Ming Chu, and Chih-Hao Hsu, “The development of P-type transparent conductive tin monoxide thin films”, Optics & Photonics Taiwan, the International Conference (OPTIC), Taiwan, 2017
86. Wei-Sheng Liu*, Wei-Ting Hsieh and Shih-Yuan Chen, “Development of high performance transoarent conductive Ti-doped GaZnO thin films for the application in CIGS solar cells”, Taiwan Vacuum Society (TVS), Taiwan, 2017
87. Wei-Sheng Liu*, Chih-Wei Wang and Yi-Ming Chu, “Investigation of P-type transparent conductive SnO thin films”, Taiwan Vacuum Society (TVS), Taiwan, 2017
88. Wei-Sheng Liu*, Di-Ting Lin, Ren-Yo Liu, and Hsiao-Chien Lin, “Amending Energy Band Alignment of Perpendicularly Aligned InGaAs Quantum Dots Covered with GaAs(Sb)/AlGaAsSb Combined Structure after Rapid Thermal Annealing”, Taiwan Vacuum Society (TVS), Taiwan, 2017- Best Paper Award
89. Wei-Sheng Liu*, Yu-Lin Chang, “Growth of GaN Thin Film on Amorphous Glass Substrate by DC-Pulse Sputtering Deposition Technique”, International Electron Devices & Materials Symposium (IEDMS) ,Taiwan, 2017
90. Wei-Sheng Liu*, Wei-Ting Hsieh, Shih-Yuan Chen, Yu Jiang, Shao-Ta Chen, Chia-Chen Wen, Hui-Yu Chen, En-Tso Huang, and Ming-En Hsu, “Using the Ti-doped GaZnO transparent conductive oxide films for the development of CIGS photovoltaics”, 24th International Workshop on Active-Matrix Flat panel Displays and Devices, Kyoto, Japan, 2017
91. Wei-Sheng Liu*, Chih-Wei Wang, Yi-Hung Lin, Chien-Lung Huang, Yi-Ming Chu, Chia-Chen Wen, En-Tso Huang, Hui-Yu Chen, Shao-Ta Chen, Ming-En Hsu and Yu-Jiang, “Using Ti-doped GaZnO/ InGaZnO/ Ti-doped GaZnO sandwich composite Structure to enhance the device performances of transparent thin-film transistors”, 24th International Workshop on Active-Matrix Flat panel Displays and Devices, Kyoto, Japan, 2017
92. Wei-Sheng Liu*, Ren-Yo Liu, Hsiang-Yu Hsiao, Di-Ting Lin, “Study of vertically aligned InGaAs quantum dots capped with GaAs(Sb)/AlGaAsSb composite structure”, International Electron Devices and Materials Symposia Conference (IEDMS),Taiwan, 2016
93. Wei-Sheng Liu*, Ren-Yo Liu, Hsiang-Yu Hsiao, “Sb aggregation for tailoring energy band alignment of vertically aligned InGaAs/GaAs(Sb)/AlGaAsSb composite quantum dot structure after thermal annealing treatment”, International Electron Devices and Materials Symposia Conference (IEDMS),Taiwan, 2016
94. Wei-Sheng Liu*, Chih-Wei Wang, Yi-Hung Lin, and Chien-Lung Huang, “Enhancing the Device Performance of Transparent Thin-Film Transistors with a Ti-doped GaZnO/ InGaZnO/ Ti-doped GaZnO Sandwich Composite-Channel Structure”, International Electron Devices and Materials Symposia Conference (IEDMS),Taiwan, 2016
95. Wei-Sheng Liu*, Hsiao-Chien Lin, Ren-Yo Liu, Min Wu, and Hsiang-Yu Hsiao “Study of optical properties of vertically-aligned InGaAs quantum dots capped by GaAsSb/AlGaAsSb composite structure”, Symposium on Nano Device Technology (SNDT),Taiwan, 2016
96. Wei-Sheng Liu*, Wei-Ting Hsieh, Yi-Hung Lin, Yu-Ming Wang, Chih-Wei Wang and Yan-Xiao Lin, “Enhancement of optoelectronic device performances by using TiO2-doping in GaZnO thin films”, Energy Material and Nanotechnology (EMN) Meeting on Titanium-Oxides, USA, 2016 –Invited Talk and Session Chair.
97. Wei-Sheng Liu*, Ying-Fu Chen, Yu-Ming Wang, Yi-Hung Lin, “Improving the Device Performances of InGaZnO Thin-Film Transistor by Using Ti-Doped GaZnO Capping Layer”, International Thin-Film Transistor Conference (ITC) ,Taiwan, 2016
98. Wei-Sheng Liu* and Wei-Ting Hsieh, “Improving the device characteristics of CIGS solar cells with high performance transparent conducting Ti-doped GaZnO thin films”, Optics & Photonics Taiwan, the International Conference (OPTIC) , 2015
99. Wei-Sheng Liu*, Ren-Yo Liu, Hsiao-Chen Lin, “Energy band-alignment tailoring by using thermal annealing treatment on the vertically-aligned InGaAs/GaAs(Sb)/AlGaAsSb quantum dots”, International Electron Devices and Materials Symposia Conference(IEDMS) ,Taiwan, 2015
100. Wei-Sheng Liu*, Yi-Hung Lin, and Chien-Lung Huang, “Improving the Device Characteristics of Transparent Thin-Film Transistors by Using a GaTiZnO/ InGaZnO/GaTiZnO Triple-Channel Structure”, International Electron Devices and Materials Symposia Conference(IEDMS) ,Taiwan, 2015
101. Wei-Sheng Liu*, R.-Y. Liu, H.-C. Lin, M. Wu, "Enhancing the dot-size uniformity of vertically-aligned InGaAs quantum dots by using the GaAsSb/AlGaAsSb composite overgrown layer" Symposium on Nano Device Technology, SNDT 2015,Taiwan, R.O.C., 2015.
102. Wei-Sheng Liu*, Hsiao-Chien Lin, Ren-Yo Liu and Min Wu, “Improvements of dot-size uniformity of the columnar InGaAs quantum dot structures with GaAs(Sb)/AlGaAsSb composite layers” 22th International Workshop on Active-Matrix Flat panel Displays and Devices, Kyoto, Japan, 2015.
103. Wei-Sheng Liu*, Chien-Lung Huang, “Development of IGZO TFT by pulse-DC magnetron sputtering deposition for enhancing the device performance”, Optics & Photonics Taiwan, the International Conference (OPTIC) , 2014
104. Wei-Sheng Liu*, Yu-Lin Chang , “Improvement of CIGS solar cell conversion efficiency by using high performance Ti-doped GaZnO transparent conductive films”, Optics & Photonics Taiwan, the International Conference (OPTIC) , 2014
105. Wei-Sheng Liu*, Hsiao-Chien Lin, and Ching-Min Chang, “Capping vertically-aligned InGaAs quantum dots with AlGaAsSb overgrown layer for improving the performances of solar cell”, International Electron Devices and Materials Symposia Conference(IEDMS), 2014 --- Best Paper Award!!
106. Wei-Sheng Liu*, Chien-Lung Huang , “Optoelectronic properties studies of IGZO thin films deposited by pulse-DC magnetron sputtering”, International Electron Devices and Materials Symposia Conference(IEDMS), 2014
107. Wei-Sheng Liu, Huai-Ming Cheng, Hung-Chun Hu, Hau-Wei Yu, Nen-Wen Pu, and Shih-Chang Liang, “Using indium tin oxide with titanium doping for transparent conductive film application on CIGS solar cells”, The 7th Vacuum and Surface Sciences Conference of Asia and Australia (VASSCAA-7), 2014
108. Wei-Sheng Liu, Huai-Ming Cheng, Hung-Chun Hu, Hau-Wei Yu, Nen-Wen Pu, and Shih-Chang Liang, “Investigation of the Optoelectronic Properties of Ti-doped Indium Tin Oxide Thin Film”, The 7th Vacuum and Surface Sciences Conference of Asia and Australia (VASSCAA-7), 2014.
109. Wei-Sheng Liu *, Hung-Chun Hu, Nen-Wen Pu, and Shih-Chang Liang, “Using a Ti/TiN Composite Structure as the Diffusion Barrier Layer for CIGS Solar Cell Application on Stainless Steel Substrates”, 21st International Workshop on Active-Matrix Flatpanel Displays and Devices, Kyoto, Japan, 2014
110. Wei-Sheng Liu *, Ying-Fu Chen, Yu-Ming Wang, “Improvement of Device Characteristics of Transparent Thin-Film Transistors by using GaTiZnO / InGaZnO4 Composite- Channel Structure”, 21st International Workshop on Active-Matrix Flatpanel Displays and Devices, Kyoto, Japan, 2014
111. W.-S. Liu*, C.-M. Chang, W.-Y. Qiu, and C. Fang, “Carrier Dynamic and Optical Properties Study of InAs Quantum Dots Capped with InGaAsSb Strain-Reducing Layer” , TACT- International Thin Films Conference, 2013
112. W.-S. Liu*, H.-C. Hu, N.-W. Pu, and S.-C. Liang, “Development of a Ti/TiN composite structure as the diffusion barrier layer in CIGS solar cells on stainless steel substrates” , TACT- International Thin Films Conference, 2013
113. W.-S. Liu*, C.-H. Chang*, S.-Y. Wu, C.-H. Tseng, C.-Y. Hung, J.-L. Huang, “Quality Improvement of Ga-doped TiZnO for Application as a Transparent Conductive Anode in Blue Phosphorescent OLEDs” , TACT- International Thin Films Conference, 2013
114. W.-S. Liu*, Y.-F. Chen, Y.-M. Wang, “Development of Transparent Ti-doped GaZnO as TFT channel layer for enhancing the device performance of ZnO based TFT”, TACT- International Thin Films Conference, 2013
115. W.-S. Liu*, Y.-F. Chen, Y.-M. Wang, “Enhanced Device Characteristics of Transparent Thin-Film Transistors with a GaTiZnO/ InGaZnO₄ Double-Layer Channel Structure”, TACT- International Thin Films Conference, 2013
116. W.-S. Liu*, S.-Y. Wu, C.-H. Tseng, and C.-Y. Hung “Development of high-quality titanium-doped gallium ZnO transparent conductive films by RF magnetron sputtering techniques”, 40^th International Symposium on Compound Semiconductors- ISCS, Kobe, Japan, 2013.
117. W.-S. Liu*, Y.-T. Wang, C.-M. Chang, W.-Y. Qiu, and C.-Fang “Study of carry dynamics of vertically aligned InAs/GaAsSb quantum dot structures”, 40^th International Symposium on Compound Semiconductors- ISCS, Kobe, Japan, 2013.
118. W.-S. Liu*, S.-Y. Wu, C.-Y. Hung, C.-H. Tseng, J.-L. Huang, I-C. Lien, Y.-S. Chang, and C.-H. Chang* “Optoelectronic Properties Enhancement of OLED by Ga-doped TiZnO Transparent Conductive Oxide Film”, International Display Manufacturing Conference- IDMC, Taipei, Taiwan, 2013.
119. W.-S. Liu*, Hsin-Lun Tseng, Tien-Hao Huang, Ting-Fu Chu, Po-Chen Kuo, Fu-Hsiang Tsao, and Jen-Inn Chyi “Characteristic improvements of vertically aligned columnar quantum dot solar cell with a GaAsSb capping layer”, Proceedings of SPIE - The International Society for Optical Engineering, Vol. 8471, pp. 21 2012.
120. Hsueh, K.-P., Cheng, Y.-C., Lin, W.-Y., Chiu, H.-C., Huang, Y.-P., Chi, G.-C., W.-S. Liu*., “Physical properties of Al-doped MgZnO film grown by RF magnetron sputtering using ZnO/MgO/Al 2O 3 target”, Proceedings of SPIE - The International Society for Optical Engineering, 2011.
121. Hsin-Lun Tseng, W.-S. Liu*, Po-Chen Kuo, Tien-Hao Huang, Ting-Fu Chu and Jen-Inn Chyi, “Improvement of optical characteristics of InAs/InGaAsSb quantum dot structures with long excited-state emission at 1.31 μm”, Optics & Photonics Taiwan, International Conference, OPTIC 2012, Taipei, R.O.C., 2012.
122. Ting-Fu Chu, W.-S. Liu*, Tien-Hao Huang1, Po-Chen Kuo, Hsin-Lun Tseng, and Jen-Inn Chyi, “Improving the optical properties of vertically aligned InAs/GaAsSb quantum dot structure by thermal annealing”, Optics & Photonics Taiwan, International Conference, OPTIC 2012, Taipei, R.O.C., 2012.
123. Tien-Hao Huang, W.-S. Liu*, Ting-Fu Chu, Hsin-Lun Tseng, and Po-Chen Kuo, “The enhancement of the carrier lifetime in columnar InAs/GaAsSb quantum dot structure by thermal-annealing induced Sb segregation”, Intl. Conf. on International Electron Devices and Materials Symposium, Kaohsiung, R.O.C., 2012.
124. Po-Chen Kuo, W.-S. Liu*, Hsin-Lun Tseng, Ting-Fu Chu, and Tien-Hao Huang, “Enhancing the optical characteristics of InAs/InGaAsSb quantum dots by rapid-thermal annealing”, Intl. Conf. on International Electron Devices and Materials Symposium, Kaohsiung, R.O.C., 2012.
125. W.-S. Liu*, Ching-Min Chang, Wen-Yu Qiu, and Chi Fang, “Study of time-resolved photoluminescence properties of InAs/InGaAsSb quantum dot structures”, Intl. Conf. on International Electron Devices and Materials Symposium, Kaohsiung, R.O.C., 2012.
126. W.-S. Liu*, Shen-Yu Wu, Chao-Yu Hung, and Ching-Hsuan Tseng, “Improvement of the Optoelectronic Properties of Ga-doped TiZnO Transparent Conductive Oxide Thin Films”, Intl. Conf. on International Electron Devices and Materials Symposium, Kaohsiung, R.O.C., 2012.
127. W.-S. Liu*, Y.-T Wang, and J.-I Chyi, “Carrier Lifetime Investigation in Type-II Vertical Aligned InAs Quantum Dot Structure with a GaAsSb Strain-Reducing Layer”, International Photonics Conference, Tainan, R.O.C. , 2011.
128. W.-S. Liu*, H.-M. Wu, F.-H. Tsao, T.-L. Hsu, Y.-A. Liao and J.-I. Chyi, “Enhancement of intermediate band solar cell by applying vertically aligned InAs/GaAsSb quantum dot structure”, International Photonics Conference, Tainan, R.O.C., 2011.
129. W.-S. Liu*, and W.-K. Chen, “Transparent Conductive Ga-doped Mg_xZn_1-xO Films with High Optical Transmittance Prepared by Radio Frequency Magnetron Sputtering”, International Electron Devices and Materials Symposium, Tainan, R.O.C., 2011.
130. W.-S. Liu*, Y.-H. Liu and W.-K. Chen, “Structure Properties of Transparent Conductive GMZO/Ag/GMZO Sandwich Structure with Different Layer Thickness and Post-Annealing Temperature”, International Electron Devices and Materials Symposium, Tainan, R.O.C., 2011.
131. W.S. Liu*, H.-M. Wu, T.-L. Hsu, F.-H. Tsao, Y.-A. Liao, and J.-I. Chyi, “Enhancement of intermediate band solar cell by vertically aligned InAs/GaAsSb quantum dots”, 38^th International Symposium on Compound Semiconductors- ISCS, Berlin, Germany, 2011.
132. W.S. Liu*, H.-M. Wu, Y.-A. Liao, J.-I. Chyi, W.-Y. Chen, T.-M. Hsu, “High Optical Property Vertically Aligned InAs Quantum Dot Structures with GaAsSb Overgrown Layers”, 16th Intl. Conf. on Molecular Beam Epitaxy, Berlin, Germany, 2010.
133. H.-M. Wu, W.-S. Liu*, T.-L. Hsu, Y.-T. Wang, and J.-I. Chyi, “Enhancemet of Dot Size Uniformity in Vertically Aligned InAs/GaAsSb Structure”, Intl. Conf. on Optics and Photonics in Taiwan, Tainan, R.O.C., 2010
134. W.-K. Chen, K.-P. Hsueh*, W.-S. Liu, Y.-P. Huang, and Y.-H. Lin, “Effect of rapid thermal annealing on Al-doped MgxZn1-xO films prepared by radio-frequency magnetron sputtering”, Intl. Conf. on Optics and Photonics in Taiwan, Tainan, R.O.C., 2010
135. W.-S. Liu*, H.-M. Wu, F.-H. Tsao, Y.-A. Liao, J.-I. Chyi, W.-Y. Chen, and T.-M. Hsu, “High Optical Property Vertical Aligned InAs Quantum Dot Structures with GaAsSb Overgrown Layers”, Intl. Conf. on Optics and Photonics in Taiwan, Tainan, R.O.C., 2010
136. D.-C. Wu, Y.-C. Lin, M.-H. Mao, W. S. Liu, P. C. Chiu, J.-I. Chyi, J. S. Wang, Gray Lin, and J. Y. Chi, “Temperature Dependences of Quantum-Dot Laser Thresholds under Simultaneously Three-State or Two-State Lasing Operations”, IEEE CLEO/QELS, San Jose, U.S.A., 2008.
137. J.-W. Shi, Y.-T. Li, C.-L. Pan, C.-H. Chiu, W.- S. Liu, J.-I. Chyi , “Characterization of a Sub- THz Photonic Transmitter Based on a Separated- Transport- Recombination Photodiode”, CLEO/QELS, Baltimore, U.S.A., 2007.
138. Lu, J.-Y., Chen, L.-J., Kao, T.-F., Chang, H.-H., Sun, C.-K., Liu, A-S., Yu, Y.-C., Wu, R.-B., Liu, W.-S., Chyi, J.-I., “Terahertz biochip for illicit drug detection”, IEEE Conference on Lasers and Electro-Optics, California, U.S.A., 2006.
139. M.-J. Shiau, P.-C. Chiu, W.-S. Liu, T.-P. Hsieh, and J.-I. Chyi , “The Effects of Antimony Irradiation on the Optical Properties of InAs QDs ”, Optics and Photonics, Hsinchu , Taiwan, R.O.C., Dec. 2006.
140. W.-S. Liu, J.-I. Chyi, W.-Y. Chen, H.-S. Chang, and T.M. Hsu, “Enhanced thermal stability and emission intensity of InAs quantum dots covered by InGaAsSb strain-reducing layer.” 14th Intl. Conf. on MBE, Tokyo, Japan, 2006.
141. J.-W. Shi, Y.-T. Li, C.-L. Pan, M.-L. Lin, Y.-S. Wu, W.-S. Liu, J.-I. Chyi, “Separated-Transport-Recombination p-i-n Photodiode (STR-PD) with High-Speed and High-Power Performance under Continuous-Wave (CW) Operation”, IEEE Conference on Lasers and Electro-Optics, California, U.S.A., 2006.
142. W.-S. Liu, J.-I. Chyi, W.-Y. Chen, H.-S. Chang, and T.M. Hsu, “Enhanced thermal stability and emission intensity of InAs quantum dots covered by InGaAsSb strain-reducing layer.” Molecular Beam Epitaxy and High-k Materials Workshop, Jhongli, Taiwan, R.O.C, 2006.
143. Lu, J.-Y., Chen, L.-J., Kao, T.-F., Chang, H.-H., Liu, A.-S., Yu, Y.-C., Wu, R.-B., Liu, W.-S., Chyi, J.-I., Pan, C.-L., Tsai, M.-C., Sun, C.-K., “Terahertz biochip based on optoelectronic devices”, Proceedings of SPIE - The International Society for Optical Engineering, 2005.
144. J.-I. Chyi , W.-S. Liu, T.-P. Hsieh, T. M. Hsu, W. H. Chang, W. Y. Chen and H. S. Chang, “Progress on InAs-Based Quantum Dot Light Emitters”, SPIE Asia-Pacific Optical Communications, Shanghai. China, 2005.
145. M.-H. Mao, L.-C. Su, K.-C. Wang, W.-S. Liu, P.-C. Chiu, J.-I. Chyi, ” Spectrally-resolved dynamics of two-state lasing in quantum-dot lasers”, Lasers and Electro-Optics Society, Australia, 2005.
146. W.-S. Liu, Holin Chang, and J.-I. Chyi, “Effects of dot-height uniformity on the performance of 1.3 um InAs quantum dot lasers”, Molecular Beam Epitaxy, Hsinchu, Taiwan, R.O.C, 2005.
147. S.-H. Chen, N.-T. Yeh, W.-S. Liu, and J.-I. Chyi, “Effects of spacer thickness on the performance of InGaAs/GaAs quantum dot lasers”, MRS Fall Meeting, Boston, U.S.A., 2001.
148. Yeh, N.-T., Liu, W.-S., Chen, S.-H., Chiu, P.-J,.and Chyi, J.-I, “InAs/GaAs quantum dot lasers with InGaP cladding layer grown by solid-source molecular beam epitaxy” 13th Intl. Conf. InP Related Materials, Nara, Japan, 2001.
149. N.-T. Yeh, W.-S. Liu, S.-H. Chen and J.-I. Chyi, “Effects of Spacer Thickness on the Performance of InGaAs/GaAs Quantum Dot Lasers”, MRS Fall Meeting, Boston, U.S.A., 2000.
150. W.-S. Liu, S.-H. Chen, N.-T. Yeh, T.-E. Nee and J.-I. Chyi, “Suppressing Temperature-Dependence of Emission Wavelength of Self-Assembled InAs Quantum Dots”, Optics and Photonics Taiwan’99, Chung-Li, Taiwan, 1999.

一、個人主持之研究計畫

 

二、共同主持之研究計畫

 

 

Speaker Invitation:

• International Workshop on Multidisciplinary Research / TVS-2017
• Energy Material and Nanotechnology EMN Meeting on Titanium-Oxides, 2016, USA
• 6th Annual New Energy Forum-2016 (NEF-2016), South Korea
• 6th Annual World Congress of Nano Science & Technology - 2016 (Nano S&T-2016), Singapore
• World Congress of Smart Materials-2015 (WCSM-2015), Korea
• World Congress of Nanoscience & Technology (NanoS&T-2014), China

 

Patent:

1. 劉維昇、林孝謙、劉人祐，“具高能隙半導體材料之量子點結構” 中華民國專利，M528017，2016。
2. 梁仕昌;李可鼎;吳政翰;林瑤冷;倪國裕;劉維昇;張鈺琳;吳聲佑，“具高導電性及高穿透率之複合式薄膜結構” 中華民國，新型專利第 M497333號，2015.
3. 劉維昇、綦振瀛，“含銻化合物之量子點光電元件”，中華民國專利，發明第 I 328291 號，2010.
4. W.-S. Liu, and J.-I. Chyi, “Quantum dot optoelectronic device having an Sb-containing overgrown layer” U.S. Patent, US7,456,423B2, 2008.

1. 劉維昇、林孝謙、劉人祐，“具高能隙半導體材料之量子點結構” 中華民國專利，M528017，2016。
2. 梁仕昌;李可鼎;吳政翰;林瑤冷;倪國裕;劉維昇;張鈺琳;吳聲佑，“具高導電性及高穿透率之複合式薄膜結構” 中華民國，新型專利第 M497333號，2015.
3. 劉維昇、綦振瀛，“含銻化合物之量子點光電元件”，中華民國專利，發明第 I 328291 號，2010.
4. W.-S. Liu, and J.-I. Chyi, “Quantum dot optoelectronic device having an Sb-containing overgrown layer” U.S. Patent, US7,456,423B2, 2008.

Book Chapters:

1. Balaji Gururajan, Venkatesh Narasihman, Done Rinshun Paul, Deveshwar Sasikumar, Wei-Sheng Liu, Bhavya Kondapavuluri, Parthasarathy Srinivasan, and Sridharan Madanagurusamy, “Metal Oxide Doping for Sensor Applications,” in Doping of Metal Oxides: From Fundamentals to Applications, Chapter 15, Elsevier, in press (expected March 2026).

Award:

• 2026年- 中國電機工程學會：傑出電機工程教授獎
• 2022年- 徐有庠紀念基金會：第21屆有庠傑出教授獎
• 2017-2021 元智大學 電機通訊學院：研究傑出獎
• 2017年台灣真空學會第六屆:年輕學者獎
• 2017年台灣真空學會:論文海報佳作獎
• 2016年中國電機工程學會：優秀青年電機工程師獎
• 2016年元智大學教師評鑑: 研究傑出獎
• 科技部104-108年度補助大專校院奬勵特殊優秀人才
• 2015年：元智大學電機通訊學院研究評鑑特優暨院研究傑出獎
• 國際電子元件與材料研討會(IEDMS), 2014： 最佳論文獎
• 教育部奈米專題成果競賽：博士班組第一名
• 台灣分子束磊晶研討會：學生論文獎第一名
• 指導學生，獲中國工程師學會論文競賽：電子組第二名
• 獲推薦當選2007年社會優秀青年
• 中華民國斐陶斐學會榮譽會員
• 元智大學工程論文競賽獎，以及學術金質獎章
• 2007-2009 於晶元光電服務期間：In Epistar Corporation:
  • Outstanding Contribution Award in 2008
  • Excellent Report Award in 2007
  • Superior Performances in Semiconductor Device and Physics

在研究團隊建立、人才培育及服務方面的重要貢獻及成就:

建立奈米光電元件研究團隊，以半導體材料成長、薄膜製程、元件製作與光電量測為核心，培養學生實驗規劃、數據分析、論文撰寫及學術發表能力。學生與研究團隊近年持續於光電、鍍膜及真空科技相關研討會獲獎，代表性成果如下。

學生與研究團隊獲獎紀錄

產學人才培育與教育服務

• 半導體人才學程（2023–2026）：擔任電機工程學系學程召集人，參與台積電元件／整合及半導體人才學程規劃，連結課程與產業需求。
• 工程教育品質（2026）：參與推動電機工程學系學士班、碩士班、博士班及碩士在職專班通過IEET六年認證，有效期間為2026年至2031年。
• 產業與國際人才交流：參與中強光電人才培育，以及與印度SASTRA University、Tata Electronics之VLSI／半導體人才培育及交流合作。

在研究團隊建立、人才培育及服務方面的重要貢獻及成就:

• 指導學生張鈺琳參與：2018晶鷹盃光電科技競賽，入圍
• 指導學生楊庭愷、連德宇，獲 106學年度電機通訊學院學生工程論文競賽:特優等獎
• 指導學生林帝廷，獲 2017年 台灣真空學會論文發表會:佳作獎
• 指導學生陳詩元，獲 2017年 OPTIC研討會海報論文: 最佳論文獎 Best Paper Award
• 指導學生林孝謙、吳敏，獲 2014年中國工程師學會論文競賽：電子組第二名
• 指導學生林孝謙、張清閔，獲 2014年 International Electron Devices and Materials Symposia Conference(IEDMS)： 最佳論文獎 Best Paper Award!!
• 指導學生吳宏明、陳威谷、曹福翔、吳聲佑、邱雯郁、方淇 元智大學 學術金質獎章／期刊論文獎

Editor and Committee: 

• International Electron Devices & Materials Symposium (IEDMS 2023, 2026) – Technical Program Committee Member
  2023 Track C: Novel Materials, Large-Area Electronics, and Related Applications
  2026 Track B: High-Frequency and Power Devices, and Compound Semiconductor Technologies

• 2023-2024 國防部軍備局-國防先進科技研究技術審議組聘任委員
• Optics & Photonics Taiwan International Conference 2023 (OPTIC 2023) - Steering Committee
• International Electron Devices and Materials Symposium 2021 – Paper Reviewer
• 2020 Optics & Photonics Taiwan, International Conference (OPTIC 2020) - Technical program committee
• 2019 Optics & Photonics Taiwan, International Conference (OPTIC 2019) - Technical program committee
• 擔任 2019-2020 國防部科技研究中心- 技術審議組委員
• 擔任真空學會出版：「真空科技」期刊 – 副總編輯與執行編輯
• 擔任經濟部能源局業界能專計畫– 計畫審查委員
• 2017 真空學會 - 年度會員大會暨論文發表會 - 籌備委員會學術組委員
• Energy Material and Nanotechnology (EMN) meeting - Session Chair
• International Electronic Device and Material Symposium: Session Chair
• International Photonic Conference: Committee
• International Electronic Device and Material Symposium: Session Chair
• 2011 International Photonics Conference- Program committee
• LED工程師基礎能力鑑定題庫命題 委員
•