Publications
Books and Book Chapters
(1) H.W. Choi, editor, “Handbook of Optical Microcavities”, Pan Stanford, to be published in 2012.
(2) H.W. Choi, “Nitride Microdisplay and Micro-scale Light Emitting Diodes”, in “III-Nitride Devices and Nano-Engineering”, Editor Zhe Chuan Feng, Imperial College Press, August 2008, ISBN 978-1-84816-223-5.
(3) H.W. Choi, “Nanostructured Nitride Light Emitting Diodes”, in “Handbook of Light Emitting and Schottky Diode”, Editor N.P. Chen, Nova Publishers, 2009, ISBN 978-1-60692-462-4.
(4) W.Y. Fu and H.W. Choi, “Nanosphere Lithography for Nitride Semiconductors”, in “Lithography”, Editor Michael Wang, In-tech, pp 615-628, 2010, ISBN 978-953-307-064-3.
Patents
(a) Granted
(1) Inventor, “Semiconductor Color-tunable Broadband Light Sources and Full-Color Microdisplays” US Patent 7,982,228 (July 2011).
(2) Inventor, “Method of making white light LEDs and continuously wavelength tunable LEDs”, Chinese patent ZL 2007 8 002814.1 (November 2010).
(3) Second Inventor, “Micro-LEDs”, US Patent 7,598,149 (October 2009).
(b) Pending
(4) Inventor, “Light-emitting Diode Chip Geometry and Luminaire”, US Provisional Patent Application US61/497,592.
(5) Inventor, “Chip Stacking”, US Provisional Patent Application US61/487,890.
(6) Inventor, “Semiconductor Color-tunable Broadband Light Sources and Full-Color Microdisplays”, International PCT application PCT/CN2009/001113.
(7) Inventor, “Method of making white light LEDs and continuously wavelength tunable LEDs”, US patent application 11/780,082; International PCT application PCT/CN2007/002208.
(8) Co-Inventor, “Improvements in and relating to Vertical-cavity Semiconductor Optical Devices”, British Patent Application GB0306800.4, filed 24 Mar 2003; International PCT Patent Application PCT/GB2004/001285, filed on 24 Mar 2004.
Journal Articles [Impact Factor; Cites] Total cites: 726; h-index: 16
(1) L.F. Deng, Y.R. Liu, H.W. Choi, C.M. Che and P.T. Lai, “Improved Performance of Pentacene OTFTs with HfLaO Gate Dielectric by Using Fluorination and Nitridation”, IEEE Transactions on Device and Materials Reliability (2012). [1.483 ; 0]
(2) K.H. Li, Z.T. Ma and H.W. Choi, “Tunable clover-shaped GaN photonic bandgap structures patterned by dual-step nanosphere lithography”, Applied Physics Letters 100 (2012). [3.820 ; 0]
(3) Q. Zhang, K.H. Li and H.W. Choi, “InGaN light-emitting diodes with indium-tin-oxide sub-micron lenses patterned by nanosphere lithography”, Applied Physics Letters 100, 061120 (2012). [3.820 ; 0]
(4) L.F. Deng, Y.R. Liu, H.W. Choi, J.P. Xu, C.M. Che and P.T. Lai, “Effects of Annealing Temperature and Gas on Pentacene OTFTs with HfLaO as Gate Dielectric”, IEEE Transactions on Device and Materials Reliability 12, 107 (2012). [1.483 ; 0]
(5) S.Y. Huang, W.C. Chew, Y.G, Liu, B.-I. Wu and H.W. Choi, “A Pancake-shaped Nano-aggregate for Focusing Surface Plasmons”, Journal of Applied Physics 111, 034308 (2012). [2.064 ; -]
(6) K.H. Li, Zetao Ma and H.W. Choi, “Single-mode Whispering Gallery Lasing from Metal-clad GaN Nano-pillars”, OSA Optics Letters 37, 374 (2012). [3.318 ; -]
(7) X.H. Wang, J.Q. Ning, S.J. Xu and H.W. Choi, “Raman and photoluminescence characterization of focused ion beam patterned InGaN/GaN multi-quantum-wells nanopillar array”, Journal of Applied Physics 110, 093111 (2011). [2.064 ; -]
(8) L. Zhu, S.Y. Huang, P.T. Lai and H.W. Choi, “Fiber-coupled Light-emitting Diode with a Capillary-bonded Hemispherical Lens”, IEEE Photonics Technology Letters 23, 1859 (2011). [1.987 ; -]
(9) K.H. Li and H.W. Choi, “InGaN light-emitting diodes with Indium-Tin-Oxide photonic crystal current-spreading layer”, Journal of Applied Physics 110, 053104 (2011). [2.064 ; 2]
(10) L. Zhu, P.T. Lai and H.W. Choi, “Microlens Array on Flip-chip LED Patterned with an Ultraviolet Micro-pixelated Emitter”, IEEE Photonics Technology Letters 23, 1067 (2011). [1.987 ; 1]
(11) G.Y. Mak, L. Zhu, Z. Ma, S. Huang, E.Y. Lam and H.W. Choi, “Plasmonically-enhanced quantum-dot white-light InGaN light-emitting diode”, Journal of Physics D: Applied Physics 44, 224016 (2011). [2.105 ; -]
(12) K.H. Li, Z.T. Ma and H.W. Choi, “High-Q whispering-gallery mode lasing from nanosphere-patterned GaN nano-ring arrays”, Applied Physics Letters 98, 071106 (2011). [3.820 ; 0]
(13) G.Y. Mak, E.Y. Lam and H.W. Choi, “Liquid-immersion Laser Micromachining of GaN Grown on Sapphire”, Applied Physics A 102, 441 (2011). [1.760 ; 3]
(14) K.H. Li and H.W. Choi, “Tuning of photonic bandgap via dimensional control of nanopillars”, Physica Status Solidi (c) 8, 2351 (2011).
(15) G.Y. Mak, E.Y. Lam and H.W. Choi, “Liquid-immersion Laser Micromachining of GaN Trenches and its Applications in Device Fabrication”, Physica Status Solidi (c) 8, 2229 (2011).
(16) Z.L. Li, K.H. Li and H.W. Choi, “Reliability Study on Micro-structured InGaN Light-emitting Diodes”, Physica Status Solidi (c) 8, 2258 (2011).
(17) K.H. Li and H.W. Choi, “Air-spaced GaN nanopillar photonic bandgap structures patterned by nanosphere lithograpy”, Journal of Applied Physics 109, 023107 (2011). [2.064 ; 5]
(18) L. Zhu, Z.T. Ma, P.T. Lai and H.W. Choi, “Vertically-mounted InGaN-on-Sapphire Light-emitting Diodes”, IEEE Transactions on Electron Devices 58, 490 (2011). [2.255 ; 0]
(19) L.F. Deng, P.T. Lai, W.B. Chen, J.P. Xu, Y.R. Liu, H.W. Choi and C.M. Che, “Effects of Different Annealing Gases on Pentacene OTFT with HfLaO Gate Dielectric”, IEEE Electron Device Letters 32, 93 (2011). [2.714 ; 2]
(20) G.Y. Mak, E.Y. Lam and H.W. Choi, “Interconnected alternating-current light-emitting diode arrays isolated by laser micromachining”, Journal of Vacuum Science and Technology 29, 011025 (2011). [1.268 ; 0]
(21) Z.L. Li, K.H. Li and H.W. Choi, “Mechanism of Optical Degradation in micro-structured InGaN Light-emitting Diodes”, Journal of Applied Physics 108, 114511 (2010). [2.064 ; 2]
(22) X.H. Wang, P.T. Lai and H.W. Choi, “The contribution of sidewall light extraction to efficiencies of polygonal LEDs shaped with laser micro-machining”, Journal of Applied Physics 108, 023110 (2010). [2.064 ; 3]
(23) R. Chen, H.D. Sun, T. Wang, K.N. Hui and H.W. Choi, “Optically-pumped Ultraviolet Lasing from Nitride Nanopillars at Room Temperature”, Applied Physics Letters 96, 241101 (2010). [3.820 ; 10]
(24) Z.L. Li, P.T. Lai and H.W. Choi, “Failure Analysis of InGaN/GaN LEDs with Emission Wavelength between 440 nm and 550 nm”, Physica Status Solidi (c) 7, 2202 (2010).
(25) X.H. Wang, P.T. Lai and H.W. Choi, “Design and Performance of LEDs with Circular Geometry”, Physica Status Solidi (c) 7, 2144 (2010).
(26) G.Y. Mak, E.Y. Lam and H.W. Choi, “Deep Etch of GaN by Laser Micromachining”, Physica Status Solidi (c) 7, 2151 (2010).
(27) L. Zhu, P.T. Lai and H.W. Choi, “An Ultraviolet micro-LED Array and its Application for Microlens Fabrication”, Physica Status Solidi (c) 7, 2174 (2010).
(28) G.Y. Mak, E.Y. Lam and H.W. Choi, “Precision Laser Micromachining of Trenches in GaN-on-sapphire”, Journal of Vacuum Science and Technology 28, 380 (2010). [1.268 ; 4]
(29) Z.L. Li, P.T. Lai and H.W. Choi, “Reliability Study on Green InGaN/GaN Light-emitting Diodes”, Journal of Physics: Conference Series 209, 012065 (2010). [- ; 1]
(30) W.Y. Fu, K.Y.Y. Wong and H.W. Choi, “Room Temperature Photonic Crystal Band-edge Lasing from Nanopillar Array on GaN patterned by Nanosphere Lithography”, Journal of Applied Physics 107, 063104 (2010). [2.064 ; 4]
(31) L. Zhu, X.H. Wang, P.T. Lai and H.W. Choi, “Angularly-uniform White Light-emitting Diodes Using and Integrated Reflector Cup,” IEEE Photonics Technology Letters 22, 513 (April 2010). [1.987 ; 5]
(32) X.H. Wang, W.Y. Fu, P.T. Lai and H.W. Choi, “Evaluation of InGaN/GaN Light-emitting Diodes of Circular Geometry”, OSA Optics Express 17, 22311 (2009). [3.749 ; 10]
(33) Z.L. Li, S. Tripathy, P.T. Lai and H.W. Choi, “Effect of Indium Content on Performance and Reliability of InGaN/GaN Light-emitting Diodes”, Journal of Applied Physics 106, 094507 (2009). [2.064 ; -]
(34) W.Y. Fu, K.K.Y. Wong and H.W. Choi, “Closed-packed Hemi-ellipsoid Arrays: A Photonic Bandgap Structure Patterned by Nanosphere Lithography”, Applied Physics Letter 95, 133125 (2009). [3.820 ; 6]
(35) Z.L. Li, P.T. Lai and H.W. Choi, “A Reliability Study on Green InGaN/GaN Light-emitting Diodes”, IEEE Photonics Technology Letters 21, 1429 (2009). [1.987 ; 6]
(36) Q. Chen, H.W. Choi and N. Wong, “Robust Simulation Methodology for Surface Roughness Loss in Interconnect and Package Modelings”, IEEE Transcations on CAD 28, 1654 (2009). [1.252 ; 1]
(37) K.N. Hui, X.H. Wang, Z.L. Li, P.T. Lai and H.W. Choi, “Design of Vertically-stacked Polychromatic Light-emitting Diodes”, OSA Optics Express 17, 9873 (2009). [3.749 ; 2]
(38) W.Y. Fu, K.N. Hui, X.H. Wang, K.K.Y. Wong, P.T. Lai and H.W. Choi, “Geometrical Shaping of InGaN Light-emitting Diodes by Laser Micromachining”, IEEE Photonics Technology Letters 21, 1078 (2009). [1.987; 8]
(39) L. Zhu, C.W. Ng, N. Wong, K.K.Y. Wong, P.T. Lai and H.W. Choi, “Pixel-to-pixel Fiber-coupled Emissive Micro-light-emitting Diode Arrays”, IEEE Photonics 1,1 (2009). [2.344 ; 2]
(40) X.H. Wang, P.T. Lai and H.W. Choi, “Laser-micromachining of Optical Microstructures with Inclined Sidewall Profile”, Journal of Vacuum Science and Technology B 27, 1048 (2009). [1.268 ; 7]
(41) K.N. Hui, P.T. Lai and H.W. Choi, “Vertically-stacked color-tunable LEDs”, Physica Status Solidi (c) 6, S902 (2009). [- ; 1]
(42) G.Y. Mak, W.Y. Fu, E.Y. Lam and H.W. Choi, “Metallic Nanoparticle Array on GaN by microsphere lithography”, Physica Status Solidi (c) 6, S654 (2009). [- ; 1]
(43) W.Y. Fu, K.K.Y. Wong and H.W. Choi, “A Novel GaN Photonic Crystal Structure Comprising Nanopillars with Inclined Sidewalls”, Physica Status Solidi (c) 6, S639 (2009). [- ; 1]
(44) K.N. Hui, Y.F. Fu, W.N. Ng, C.H. Leung, P.T. Lai, K.K.Y. Wong and H.W. Choi, “Polychromatic Light-emitting Diodes with a Fluorescent Nanosphere Opal Coating”, Nanotechnology 19, 355203 (2008). [3.644 ; 5]
(45) W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, “Photonic Crystal Light-emitting Diodes Fabricated by Microsphere Lithography”, Nanotechnology 19, 255302 (2008). [3.644 ; 20]
(46) K.N. Hui, P.T. Lai and H.W. Choi, “Spectral Conversion with fluorescent microspheres for light emitting diodes”, OSA Optics Express 16, 13 (2008). [3.749 ; 6]
(47) W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, “Nanostructuring GaN using Microsphere Lithography”, Journal of Vacuum Science and Technology B 26, 76 (2008). [1.268 ; 3]
(48) K.N. Hui, W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, “Polychromatic Emission from Fluorescent-Microsphere- Coated LEDs”, Physica Status Solidi 5, 2201 (2008).
(49) W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, “Micro-pixel Light Emitting Diodes with Wavelength-tunable Output”, Physica Status Solidi 5, 2198 (2008). [- ; 1]
(50) W.N. Ng, X.H. Wang, C.H. Leung, P.T. Lai and H.W. Choi, “Nanopatterning GaN with Microspheres”, Physica Status Solidi 5, 1615 (2008). [- ; 1]
(51) H.W. Choi, B.L. Yang, P.T. Lai, P. Chen and S.J. Chua, “GaN-MQW Microdisks Pivoted on Si Substrate”, Physica Status Solidi (a) 204, 272 (2007). [1.458 ; -]
(52) H.W. Choi, K.N. Hui, P.T. Lai, P. Chen, X.H. Zhang, J.H. Teng, S. Tripathy and S.J. Chua, “Stimulated Emission from Free-standing GaN/Si Microdisk Structures”, Physica Status Solidi (c) 4, 2358 (2007).
(53) H.W. Choi, K.N. Hui, P.T. Lai, P. Chen, X.H. Zhang, S. Tripathy, J.H. Teng and S.J. Chua, “Lasing in GaN Microdisks Pivoted on Si”, Applied Physics Letters 89, 211101 (2006). [3.820 ; 24]
(54) H.W. Choi and S.J. Chua, “Honeycomb GaN Micro-light-emitting Diodes”, Journal of Vacuum Science and Technology B 24, 800 (2006). [1.268 ; 10]
(55) H.W. Choi and S.J. Chua, “Hexagonally-closed-packed Micro-light-emitting Diodes”, Physica Status Solidi (c) 3, 2219 (2006). [- ; -]
(56) C.-L. Lee, H.W. Choi, E. Gu and M.D. Dawson, “Fabrication and Characterization of Diamond Micro-optics”, Diamond and Related Materials 15, 725 (2006) [1.825 ; 18]
(57) H.W. Choi, E. Gu, C. Liu, C. Griffin, J.M. Girkin and M.D. Dawson, “Fabrication of Natural Diamond Microlenses by Plasma Etching”, Industrial Diamond Review 65, 29 (2005).
(58) H.W. Choi and M.D. Dawson, “Improved Current Spreading in 370 nm AlGaN Micro-ring Light Emitting Diodes”, Applied Physics Letters 85, 053504 (2005). [3.820 ; 7]
(59) H.W. Choi, C.W. Jeon, M.D. Dawson, P.R. Edwards, R.W. Martin, S. Tripathy and S.J. Chua, “InGaN Nano-ring Structures for High-efficiency LEDs”, Applied Physics Letters 86, 021101 (2005). [3.820 ; 21]
(60) H.W. Choi, E. Gu, C. Liu, J.M. Girkin and M.D. Dawson, “Fabrication and Evaluation of GaN Negative and Bifocal Microlenses”, Journal of Applied Physics 97, 063101 (2005). [2.064 ; 7]
(61) C. Griffin, E. Gu, H.W. Choi, C.W. Jeon, G. McConnell, J.M. Girkin and M.D. Dawson, “Beam Divergence Measurements of InGaN/GaN Micro-arrayed Light-emitting Diodes Using Confocal Microscopy”, Applied Physics Letters 86, 041111 (2005). [3.820 ; 16]
(62) H.W. Choi, E. Gu, C. Liu, C. Griffin, J.M. Girkin and M.D. Dawson, “Fabrication of Natural Diamond Microlenses by Plasma Etching”, Journal of Vacuum Science and Technology B 23, 130 (2005). [1.268 ; 20]
(63) H.W. Choi, C.W. Jeon and M.D. Dawson, “Tapered-sidewall Dry Etching for GaN and its Applications in Device Fabrication”, Journal of Vacuum Science and Technology B 23, 99 (2005). [1.268 ; 6]
(64) H.W. Choi, C. Liu, M.G. Cheong, J. Zhang and S.J. Chua, “Exposure of Defects in GaN by Plasma Etching”, Applied Physics A 80, 405 (2005). [1.760 ; 7]
(65) H.W. Choi and M.D. Dawson, “Enhanced areal efficiency from 370 nm AlGaN micro-ring light emitting diodes“, Physica Status Solidi (c) (2005). [- ; -]
(66) H.W. Choi, E. Gu, J.M. Girkin and M.D. Dawson, “Nitride micro-display with integrated micro-lenses“, Physica Status Solidi (c) (2005). [- ; 1]
(67) H.W. Choi, C.W. Jeon and M.D. Dawson, “High-resolution 128x96 Nitride Microdisplay”, IEEE Electron Device Letters 25, 277 (2004). [2.714 ; 22]
(68) C.W. Jeon, H.W. Choi, E. Gu and M.D. Dawson, “High-density, Matrix-addressable AlInGaN-based 368 nm Micro-array Light-emitting Diodes”, IEEE Photonics Technology Letters 16, 2421 (2004). [1.987; 31]
(69) H.W. Choi, C. Liu, E. Gu, G. McConnell, J.M. Girkin, I.M. Watson and M.D. Dawson, “GaN micro-Light Emitting Diode Arrays with Monolithically-integrated Sapphire micro-lenses”, Applied Physics Letters 84, 2253 (2004). [3.820 ; 55]
(70) J.M. Girkin, E. Gu, C. Griffin, H.W. Choi, M.D. Dawson and G. McConnell, “Use of Confocal and Multiphoton Microscopy for the Evaluation of Micro-optical Components and Emitters”, Microscopy Research and Techniques 64, 293 (2004). [1.712 ; 1]
(71) E. Gu, H.W. Choi, G. McConnell, C. Liu, C. Griffin, J.M. Girkin, I.M. Watson, and M.D. Dawson, “Reflection / Transmission Confocal Microscopy Characterisations of Single Crystal Diamond Microlens Arrays”, Applied Physics Letters 84, 2754 (2004). [3.820 ; 37]
(72) H.W. Choi, C.W. Jeon and M.D. Martin, “Fabrication of Matrix-addressable Micro-LED Arrays Based on a Novel Etch Technique” Journal of Crystal Growth 268, 527 (2004). [1.737 ; 7]
(73) E. Gu, C.W. Jeon, H.W. Choi, G. Rice, M.D. Dawson, E.K. Illy and M.R.H. Knowles, “Micromachining and dicing of sapphire, gallium nitride and micro-LED devices with UV copper vapour laser”, Thin Solid Films 453, 462 (2004). [1.909 ; 12]
(74) H.W. Choi, P.R. Edwards, C.W. Jeon, R.W. Martin, M.D. Dawson, S. Tripathy and S.J. Chua, “Sub-micron InGaN Ring Structures for High-efficiency LEDs”, Physica Status Solidi (c) 1, 202 (2004). [- ; -]
(75) H.W. Choi, C.W. Jeon and M.D. Dawson, “InGaN Microring Light Emitting Diodes”, IEEE Photonics Technology Letters 16, 33 (2004). [1.987; 14]
(76) H.W. Choi, P.R. Edwards, R.W. Martin and M.D. Dawson, “High Extraction Efficiency InGaN Micro-ring Light Emitting Diodes”, Applied Physics Letters 83, 4483 (2003). [3.820 ; 54]
(77) M.A. Rana, T. Osipowicz, H.W. Choi, M.B.H. Breese and S.J. Chua, “A Study of the material loss and other processes involved during annealing of GaN at growth temperatures”, Chemical Physics Letters 380, 105 (2003). [2.280 ; 10]
(78) H.W. Choi, C.W. Jeon and M.D. Dawson, “InGaN Light Emitting Diodes of Micro-ring Geometry”, Physica Status Solidi (c) 0, 2185 (2003). [- ; 1]
(79) H.W. Choi, C.W. Jeon and M.D. Dawson, “Low Resistivity p-type Contacts to GaN by Plasma Treatments”, Physica Status Solidi (c) 0, 2210 (2003). [- ; -]
(80) C.W. Jeon, H.W. Choi and M.D. Dawson, “A Novel Fabrication Method for a 64x64 Matrix-addressable GaN-based micro-LED Array”, Physica Status Solidi (a) 200, 79 (2003). [1.458 ; 5]
(81) C.W. Jeon, H.W. Choi and M.D. Dawson, “Fabrication of Matrix-addressable InGaN-based Microdisplays of High Array Density”, IEEE Photonics Technology Letters 15, 1516 (2003). [1.987; 17]
(82) H.W. Choi, M.G. Cheong, M. Rana, S.J. Chua, T. Osipowicz and J.S. Pan, “Rutherford Backscattering Analysis of GaN Decomposition”, Journal of Vacuum Science and Technology B 21, 1080 (2003). [1.268 ; 8]
(83) M.A. Rana, T. Osipowicz, H.W. Choi, M.B.H. Breese, F. Watt and S.J. Chua, “Stoichiometric and Structural Alterations in GaN Thin Films during Annealing”, Applied Physics A 77, 103 (2003). [1.760 ; 9]
(84) H.W. Choi, C.W. Jeon, M.D. Martin, P.R. Edwards, R.W. Martin and S. Tripathy, “Mechanism of Enhanced Light Output Efficiency in InGaN-based Micro-light Emitting Diodes”, Journal of Applied Physics 93, 5978 (2003). [2.201 ; 42]
(85) H.W. Choi, C.W. Jeon, M.D. Martin, P.R. Edwards and R.W. Martin, “Fabrication and Performance of Parallel-addressed InGaN Micro-LED Arrays”, IEEE Photonics Technology Letters 15, 510 (2003). [1.987 ; 29]
(86) M.G. Cheong, C.W. Liu, H.W. Choi, B.K. Lee, E.–K. Suh and H.J. Lee, “Study of Luminescent Origin in High Indium Content Composition InGaN/GaN Quantum Wells” Journal of Applied Physics 93, 4691(2003). [2.201 ; 12]
(87) H.W. Choi, M. Rana, S.J. Chua, T. Osipowicz and J.S. Pan, “Surface Analysis of GaN Decomposition”, Semiconductor Science Technology 17, 1223 (2002). [1.323 ; 16]
(88) H.W. Choi, S.J. Chua and S. Tripathy, “Morphological and Structural Analyses of Plasma-Induced Damage to n-type GaN”, Journal of Applied Physics 92, 4381 (2002). [2.201 ; 9]
(89) M.A. Rana, T. Osipowicz, L. Wielunski, F. Watt and A. Choi, “Energy Loss Measurements in GaN Single Crystal Grown on Sapphire”, Nuclear Science Journal 38, 301 (2001).
(90) H.W. Choi, J. Zhang and S.J. Chua, “Dislocation Scattering in n-type GaN”, Material Science in Semiconductor Processing 4, 567 (2001). [0.650 ; 7]
(91) S.J. Chua, H.W. Choi, J. Zhang and P.Li, “Vacancy Effects on Plasma-Induced Damage to n-GaN”, Physical Review B 64, 205302 (2001). [3.322 ; 14]
(92) H.W. Choi and S.J. Chua, “The Link Between Gallium Vacancies and Plasma Damage to n-GaN”, Physica Status Solidi (a) 188, 393 (2001). [1.458 ; 2]
(93) H.W. Choi, X.J. Kang and S.J. Chua, “Surface Modification and Ohmic Contact Formation to n- and p-type GaN”, Physica Status Solidi (a) 188, 399 (2001). [1.458 ; 6]
(94) H.W. Choi, S.J. Chua, A. Raman, J.S. Pan, A.T.S. Wee, “Plasma-Induced Damage to n-type GaN”, Applied Physics Letters 77, 1795 (2000). [3.820 ; 48]
Invited Talks
(1) H.W. Choi, invited speaker, “Color-tunable LED Technologies”, presented at the Optical Engineering International Conference 2011, Hong Kong, (November 2011).
(2) H.W. Choi, invited speaker, “Color-tunable Light-emitting Diode Technologies”, to be presented at the International Conference on Advanced Electromaterials, Jeju, South Korea (November 2011).
(3) H.W. Choi, invited speaker, “Vertical Integration of Light-emitting Diode Chips”, to be presented at the 6th IEEE Electron Devices & Solid-State Circuits Conference, Tianjin, China (November 2011).
(4) H.W. Choi, invited speaker, “The Potentials of Energy-savings Solid-state Lighting”, to be presented at the 2011 HKIE Electrical Symposium, Hong Kong (October 2011).
(5) H.W. Choi, invited speaker, “Color-tunable LED technologies for display and lighting”, to be presented at International Lighting & Display KOREA 2011, Daegu, Korea (September 2011).
(6) X.H. Wang, L. Zhu and H.W. Choi, invited speaker, “Novel LED Geometries Shaped by Laser Micromachining”, presented at Green Photonics, Photonics Global Conference 2010, Singapore (December 2010).
(7) W.Y. Fu, K.H. Li and H.W. Choi, invited speaker, “From Nanosphere Lithography to Self-assembled Photonic Crystals”, presented at Progress in Electromagnetics Research Symposium, Cambridge MA, USA (July 2010).
(8) M.D. Dawson, H.W. Choi, C.W. Jeon, E. Gu, J.M. Girkin and C. Griffin, “Advances in high-density InGaN micro-LED arrays with integrated micro-optical elements”, invited talk at ISBLLED-2004, Gyeongju, Korea, March 2004.
(9) C. Griffin, H.W. Choi, J. Girkin, E. Gu, C.W. Jeon, C. Liu, G. McConnell, I.M. Watson and M.D. Dawson, “GaN Micro-LED Arrays with Integrated Microlenses”, invited talk at SPIE International Symposium Microelectronics, MEMs and Nanotechnology, Perth, Australia, December 2003.
Conferences Presentations
(10) K.H. Li, Z.T. Ma and H.W. Choi, “Clover-shaped GaN Photonic Bandgap Structures Patterned by Repated Nanosphere Lithography”, to be presented at the 9th International Conference on Nitride Semiconductors, Glasgow, UK (July 2011).
(11) Z.T. Ma and H.W. Choi, “Color-tunable Emitter Implemented with a Group-addressable micro-LED and Jet-printed Pixels”, to be presented at the 9th International Conference on Nitride Semiconductors, Glasgow, UK (July 2011).
(12) K.H. Li, G.Y. Mak and H.W. Choi, “Hexagonally-arranged Ag nanoparticles embedded within GaN nanopillar arrays”, to be presented at the 9th International Conference on Nitride Semiconductors, Glasgow, UK (July 2011).
(13) K.H. Li and H.W. Choi, “Light-emitting diode with photonic crystal on ITO film”, to be presented at the 9th International Conference on Nitride Semiconductors, Glasgow, UK (July 2011).
(14) Q. Zhang, X.H. Zhang, K.H. Li and H.W. Choi, “Polarization of GaN light-emitting diode with 3D opal-based photonic crystals”, to be presented at the 9th International Conference on Nitride Semiconductors, Glasgow, UK (July 2011).
(15) Y.F. Cheung and H.W. Choi, “Color-tunable LEDs implemented by a tightly-integrated chip stacking approach”, to be presented at the 9th International Conference on Nitride Semiconductors, Glasgow, UK (July 2011).
(16) K.H. Li, K.Y. Zhang, S.J. Chua and H.W. Choi, “Interconnected nano-pillar photonic crystal LEDs via epitaxial lateral overgrowth”, to be presented at the 9th International Conference on Nitride Semiconductors, Glasgow, UK (July 2011).
(17) X.H. Wang, J.Q. Ning, S.J. Xu and H.W. Choi, “Optical Investigations of FIB patterned InGaN/GaN MQW Nanopillar Array”, to be presented at 38th International Symposium on Compound Semiconductors, Berlin, Germany (May 2011).
(18) K.H. Li and H.W. Choi, “Single whispering gallery mode lasing from metal-clad GaN nanopillar array”, presented at 38th International Symposium on Compound Semiconductors, Berlin, Germany (May 2011).
(19) R. Chen, H.D. Sun, T. Wang, K.N. Hui and H.W. Choi, “Ultraviolet Lasing from AlGaN Nanopillars Patterned by Nanosphere Lithography”, presented at 2010 Microoptics Conference, Hsinchu, Taiwan (October 2010).
(20) K.H. Li and H.W. Choi, “Hexagonal-close-packed Nano-ring Array Fabricated by Nanosphere Lithography”, presented at 2010 Microoptics Conference, Hsinchu, Taiwan (October 2010).
(21) Y. Gong, T. Wang, H.D. Sun and H.W. Choi, “343.7 nm Lasing from III-nitride Based Vertical Cavity Surface Emitting Laser via Optical Pumping”, presented at the International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).
(22) F.S. Yeung, Z.T. Ma and H.W. Choi, “Color-tunable LEDs based on a group-addressable micro-LED array”, presented at the International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).
(23) L. Zhu, S.Y. Huang, P.T. Lai and H.W. Choi, “Hemispherical InGaN/GaN Light-emitting Diode for efficient fiber coupling”, presented at the International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).
(24) G.Y. Mak, Y.F. Cheung, E.Y. Lam and H.W. Choi, “Liquid-immersion Laser Micromachining of GaN Trenches and its Application in Device Fabrication”, presented at the International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).
(25) X.H. Wang, S.J. Xu and H.W. Choi, “FIB Fabrication of GaN Nano-conical Tips”, presented at the International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).
(26) L. Zhu, P.T. Lai and H.W. Choi, “Vertically-stacked polychromatic light-emitting diodes via liquid capillarity”, presented at the International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).
(27) K.H. Li and H.W. Choi, “Tuning of Photonic Bandgap via Dimensional Control of Nanopillars”,presented at the International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).
(28) G.Y. Mak, L. Zhu, E.Y. Lam and H.W. Choi, “Plasmonically-enhanced quantum-dot white-light InGaN light-emitting diode”, presented at the International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).
(29) Z.L. Li, K.H. Li and H.W. Choi, “Reliability Study on Micro-structured InGaN Light-emitting Diodes”,presented at the International Nitride Workshop 2010, Tampa, Florida, USA (September 2010).
(30) G.Y. Mak, E.Y. Lam and H.W. Choi, “Capacitively-coupled Althernating-current Light-emitting Device for 12V Applications”, Proceedings of the 12th International Symposium on the Science and Technology of Light Sources and the 3rd International Conference on White LEDs and Solid State Lighting, Eindhoven, Netherlands, pp43-4 (July 2010).
(31) K.H. Li and H.W. Choi, “Site-controlled GaN Photonic Crystals by Nanosphere Lithography”, Proceedings of the 12th International Symposium on the Science and Technology of Light Sources and the 3rd International Conference on White LEDs and Solid State Lighting, Eindhoven, Netherlands, pp45-6 (July 2010).
(32) L. Zhu, P.T. Lai and H.W. Choi, “Hemispherical InGaN/GaN Light-emitting Diodes for Efficient Fiber Coupling”, Proceedings of the 12th International Symposium on the Science and Technology of Light Sources and the 3rd International Conference on White LEDs and Solid State Lighting, Eindhoven, Netherlands, pp523-4 (July 2010).
(33) X.H. Wang, K.Y. Lam, P.T. Lai and H.W. Choi, “Novel Polygon LEDs for Higher Light Extraction”, presented at the 8th International Symposium on Semiconductor Light Emitting Devices, Beijing, China (May 2010).
(34) L. Zhu, P.T. Lai and H.W. Choi, “Vertically-mounted LEDs for Superior Light Extraction”, presented at the 8th International Symposium on Semiconductor Light Emitting Devices, Beijing, China (May 2010).
(35) L. Zhu, X.H. Wang, P.T. Lai and H.W. Choi, “Angular uniform white light-emitting diodes with an internal reflector cup”, presented at the 2nd International Conference on White LEDs and Solid State Lighting, Taipei, Taiwan (December 2009).
(36) K.N. Hui, P.T. Lai and H.W. Choi, “RGB Stacked White LEDs”, presented at the 2nd International Conference on White LEDs and Solid State Lighting, Taipei, Taiwan (December 2009).
(37) G. Chen, H.W. Choi and P.T. Lai, “A Study on InGaN/GaN Multiple Quantum-well Hydrogen Sensor with HfTiO as Gate Dielectric”, Proceedings of the 2009 International Conference on Electron Devices and Solid-state Circuits, pp127-130, Xian, China (December 2009).
(38) L.F. Deng, H.W. Choi, P.T. Lai, Y.R. Liu and J.P. Xu, “Low-voltage polymer thin-film transistors with high-k HfTiO gate dielectric annealed in NH3 or N2”, Proceedings of the 2009 International Conference on Electron Devices and Solid-state Circuits, pp201-204, Xian, China (December 2009).
(39) X.H. Wang, P.T. Lai and H.W. Choi, “Design and Performance of LEDs with Circular Geometry”, presented at 8th International Conference on Nitride Semiconductors, Jeju, South Korea (October 2009).
(40) W.Y. Fu, K.K.Y. Wong and H.W. Choi, “Hemi-ellipsoid Photonic Crystal Structure for Light Extraction”, presented at 8th International Conference on Nitride Semiconductors, Jeju, South Korea (October 2009).
(41) W.Y. Fu, K.K.Y. Wong and H.W. Choi, “Room-temperature lasing from an array of GaN nano-tips”, presented at 8th International Conference on Nitride Semiconductors, Jeju, South Korea (October 2009).
(42) Z.L. Li, P.T. Lai and H.W. Choi, “Failure Analysis of InGaN/GaN LEDs with Emission Wavelength between 440 nm and 550 nm”, presented at 8th International Conference on Nitride Semiconductors, Jeju, South Korea (October 2009).
(43) G.Y. Mak, E.Y. Lam and H.W. Choi, “Deep Etch of GaN by Laser Micromachining”, presented at 8th International Conference on Nitride Semiconductors, Jeju, South Korea (October 2009).
(44) L. Zhu, P.T. Lai and H.W. Choi, “An ultraviolet micro-LED array and its application for microlens fabrication”, presented at 8th International Conference on Nitride Semiconductors, Jeju, South Korea (October 2009).
(45) L. Zhu, C.W. Ng, N. Wong, K.Y. Wong, P.T. Lai and H.W. Choi, “Fiber-coupled Emissive Micro-LED Arrays”, presented at Society for Information Display- Display Week, San Antonio, USA (June 2009).
(46) X.H. Wang, K.N. Hui, W.Y. Fu, K.Y. Wong, P.T. Lai and H.W. Choi, “Truncated-pyramidal Light-emitting Diodes Processed by Laser Micromachining”, to be presented at the 5th International Congress on Laser Advanced Materials Processing, Kobe, Japan (June 2009).
(47) X.H. Wang, P.T. Lai and H.W. Choi, “Laser Micro-machining of Three-dimensional Microstructures in Optical Materials”, Materials Research Society Symposium Proceedings 1179, 99 (April 2009).
(48) Z.L. Li, P.T. Lai and H.W. Choi, “Reliability Study on Green InGaN/GaN Light-emitting Diodes”, presented at the Microscopy of Semiconducting Materials XVI, Oxford, United Kingdom (March 2009).
(49) W.Y. Fu, K.K.Y. Wong and H.W. Choi, “A Novel GaN Photonic Crystal Structure Comprising Angled Nanopillars”, to be presented at the International Nitride Workshop 2008, Montreux, Switzerland (October 2008).
(50) G.Y. Mak, W.Y. Fu, E.Y. Lam and H.W. Choi, “Metallic Nanoparticle Array on GaN by Microsphere Lithography”, to be presented at the International Nitride Workshop 2008, Montreux, Switzerland (October 2008).
(51) W.N. Ng, S. Tripathy, C.H. Leung, P.T. Lai and H.W. Choi, “Fabrication of Strain-relaxed GaN Nanopillars by Nanosphere Lithography”, to be presented at the International Nitride Workshop 2008, Montreux, Switzerland (October 2008).
(52) K.N. Hui, P.T. Lai and H.W. Choi, “Vertically-stacked Color-tunable LEDs”, to be presented at the International Nitride Workshop 2008, Montreux, Switzerland (October 2008).
(53) W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, “Light-emitting Diodes with Photonic Crystal Grating Fabricated by Microsphere Lithography”, Proceeding of the 32th Workshop on Compound Semiconductor Devices and Integrated Circuits, Leuven, Belgium (May 2008), p167.
(54) K.N. Hui, W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, “High Performance White LEDs using Fluorescent Microspheres”, Proceedings of the 1st International Conference on White LEDs and Solid State Lighting, Tokyo, Japan (November 2007), p188.
(55) W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, “White LEDs with Variable Colour Temperature”, Proceedings of the 1st International Conference on White LEDs and Solid State Lighting, Tokyo, Japan (November 2007), p496.
(56) K.N. Hui, W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, “Polychromatic Emission from Fluorescent-Microsphere-Coated LEDs”, presented at 7th International Conference on Nitride Semiconductors, Las Vegas, United States (September 2007).
(57) W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, “Light Emitting Diodes with Wavelength-Tunable Output”, presented at 7th International Conference on Nitride Semiconductors, Las Vegas, United States (September 2007).
(58) W.N. Ng, X.H. Wang, C.H. Leung, P.T. Lai and H.W. Choi, “Nanopatterning GaN with Microspheres”, presented at 7th International Conference on Nitride Semiconductors, Las Vegas, United States (September 2007).
(59) W.N. Ng, K.N. Hui, C.H. Leung, P.T. Lai and H.W. Choi, “Fabrication of Microstructures in GaN Light Emitting Diodes by Microsphere Lithography”, presented at International Conference on Materials for Advanced Technologies 2007, Singapore (July 2007).
(60) K.N. Hui, W.N. Ng, C.H. Leung, P.T. Lai and H.W. Choi, “Novel Energy-efficient Solid-state White Light Sources”, presented at International Conference on Electrical Engineering 2007, Hong Kong (July 2007).
(61) W.N. Ng, K.N. Hui, C.H. Leung, P.T. Lai and H.W. Choi, “Microstructures on GaN by microsphere lithography”, presented at Microscopy of Semiconducting Materials XV, Cambridge, United Kingdom (April 2007).
(62) H.W. Choi, K.N. Hui, P.T. Lai, P. Chen, X.H. Zhang, J.H. Teng, S. Tripathy and S.J. Chua, “Stimulated Emission from Free-standing GaN/Si Microdisk Structures”, to be presented at International Workshop on Nitride Semiconductors 2006, Kyoto, Japan (October 2006).
(63) H.W. Choi, B.L. Yang, P.T. Lai, P. Chen and S.J. Chua, “Free-standing GaN-MQW Microdisks Pivoted on Si Substrate”, presented at International Symposium on Blue Laser and Light Emitting Diodes, Montpellier, France (May 2006).
(64) C.-L. Lee, H.W. Choi, E. Gu and M.D. Dawson, “Fabrication and Characterization of Diamond Micro-optics”, presented at Diamond 2005, Toulouse, France (September 2005).
(65) H.W. Choi, “White Light LEDs”, late news presentation at International Conference on Nitride Semiductors, Bremen, Germany (September 2005).
(66) H.W. Choi and S.J. Chua, “Hexagonally-closed-packed Micro-light-emitting Diodes”, presented at International Conference on Nitride Semiductors, Bremen, Germany (September 2005).
(67) C. Griffin, E. Gu, H.W. Choi, C.W. Jeon, O.J. Rolinski, D.J. S. Birch, J.M. Girkin and M.D. Dawson, “Fluorescence Excitation and Lifetime Measurements using GaN/InGaN microLED Arrays”, presented at LEOS 04, Puerto Rico (November 2004).
(68) E. Gu, H.W. Choi, C. Liu, I.M. Watson, J.M. Girkin and M.D. Dawson, “Bifocal and negative microlenses on hard optical materials”, presented at LEOS 04, Puerto Rico (November 2004).
(69) E. Gu, H.W. Choi, C. Liu, I.M. Watson, J.M. Girkin and M.D. Dawson, “Bifocal and negative microlenses on hard optical materials”, presented at the 10th Micro-optics Conference, Jena, Germany (September 2004).
(70) H.W. Choi, E. Gu, J.M. Girkin and M.D. Dawson, “Nitride micro-display with integrated micro-lenses“, presented at the International Nitride Workshop, Pittsburgh, USA (July 2004).
(71) H.W. Choi and M.D. Dawson, “Enhanced areal efficiency from 370 nm AlGaN micro-ring light emitting diodes“, presented at the International Nitride Workshop, Pittsburgh, USA (July 2004).
(72) C. Griffin, E. Gu, H.W. Choi, C.W. Jeon, G. McConnell, J.M. Girkin and M.D. Dawson, “Integration of InGaN/GaN Micro-array Light-emitting Diodes with Micro-lenses”, to be presented at Optics and Photonics 2004, Photon04, Glasgow, UK (September 2004).
(73) P.R. Edwards, R.W. Martin, H.W. Choi and M.D. Dawson, “Hyper-spectral cathodoluminescence imaging of blue light-emitting micro-devices”, presented at ISBLLED-2004, Gyeongju, Korea, March 2004.
(74) H.W. Choi, C.W. Jeon, C.Liu and M.D. Dawson, “GaN micro-LED arrays with integrated sapphire micro-lenses”, Proceedings the 16th Annual Meeting of the IEEE Lasers & Electro-optics Society (LEOS), vol 2, Tucson, USA, pp654-5.
(75) C.W. Jeon, H.W. Choi and M.D. Dawson, “Fabrication and performance of high-density, matrix addressable green and ultra-violet micro-LED arrays“, Proceedings the 16th Annual Meeting of the IEEE Lasers & Electro-optics Society (LEOS), vol 2, Tucson, USA, pp878-9.
(76) E. Gu, H.W. Choi, C.W. Jeon, G. Rice, C. Liu, I.M. Watson, M.D. Dawson, P.R. Edwards and R.W. Martin, “Microstructure fabrication in Gallium Nitride, Silicon Carbide and Diamond”, presented at Wide Bandgap Semiconductor Technology (September 2003).
(77) H.W. Choi, P.R. Edwards, C.W. Jeon, R.W. Martin, M.D. Dawson, S. Tripathy and S.J. Chua, “Sub-micron InGaN Ring Structures for High-efficiency LEDs”, presented at European MRS Fall 2003, Warsaw, Poland (September 2003).
(78) H.W. Choi, C.W. Jeon and M.D. Dawson, “InGaN Light Emitting Diodes of Micro-ring Geometry”, Proceedings of ICNS-5, Nara, Japan (May 2003).
(79) H.W. Choi, C.W. Jeon and M.D. Dawson, “Low Resistivity p-type Contacts to GaN by Plasma Treatments”, Proceedings of ICNS-5, Nara, Japan (May 2003).
(80) C.W. Jeon, H.W. Choi and M.D. Dawson, “A Novel Fabrication Method for a 64x64 Matrix-addressable GaN-based micro-LED Array”, Proceedings of ICNS-5, Nara, Japan (May 2003).
(81) E. Gu, C.W. Jeon, H.W. Choi, G. Rice, M.D. Dawson, E.K. Illy and M.R.H. Knowles, “Micromachining and dicing of sapphire, gallium nitride and micro-LED devices with UV copper vapour laser”, presented at E-MRS 2003 Spring Meeting, Strasbourg, France, June 2003.
(82) G. McConnell, E. Gu, C. Griffin, C.W. Jeon, H.W. Choi, J.M. Girkin and M.D. Dawson, “Structural and Performance Evaluation of Gallium Nitride micro-LED Arrays via Multiphoton Fluorescence Imaging”, presented at the 15th International Conference on Confocal Microscopy, Italy, 2003.
(83) H.W. Choi, C.W. Jeon and M.D. Martin, “Fabrication of Matrix-addressable Micro-LED Arrays Based on a Novel Etch Technique” presented at ICMAT 2003, Singapore (December2003).
(84) G. McConnell, E. Gu, C. Griffin, C.W. Jeon, H.W. Choi, A.M. Gurney, J.M. Girkin and M.D. Dawson, “Two-photon Fluorescence Imaging of Gallium Nitride Micro-LED Arrays”, Proceedings of the 13rd International Conference on Microscopy of Semiconducting Materials, Institute of Physics Conference Series 180, pp341, Cambridge, UK, 2003.
(85) H.W. Choi, C.W. Jeon, M.D. Dawson, P.R. Edwards and R.W. Martin, “Efficient GaN-based micro-LED Arrays”, in GaN and related alloys-2002, edited by C. Wetzel, E.T. Yu, J.S. Speck, A. Rizzi and Y. Arakawa, (MRS Symposium Proceedings, Pittsburgh, 2002), Vol 743.
(86) M.A. Rana, H.W. Choi, M.B.H. Breese, T. Osipowicz, F. Watt and S.J. Chua, “A Study of Decomposition of GaN During Annealing”, in GaN and related alloys-2002, edited by C. Wetzel, E.T. Yu, J.S. Speck, A. Rizzi and Y. Arakawa, (MRS Symposium Proceedings, Pittsburgh, 2002), Vol 743.
(87) C.W. Jeon, H.W. Choi and M.D. Dawson, “64x64 Matrix-Addressable Arrays of GaN-based MicroLEDs”, Proceedings of the 15th Annual Meeting of the IEEE Lasers & Electro-optics Society (LEOS), vol 2, Glasgow, UK, pp685-6.
(88) H.W. Choi and S.J. Chua, “The Relationship Between Gallium Vacancies and Plasma Damage to n-GaN”, proceedings of the Fourth International Conference on Nitride Semiconductors (ICNS-4), July 2001, Denver, USA.
(89) H.W. Choi, X.J. Kang and S.J. Chua, “Surface Modification and Ohmic Contact Formation to n- and p-type GaN”, proceedings of the Fourth International Conference on Nitride Semiconductors (ICNS-4), July 2001, Denver, USA.
(90) H.W. Choi, J. Zhang and S.J. Chua, “Dislocation Scattering in n-type GaN”, Proceedings of the International Conference on Materials for Advanced Technologies, July 2001, Singapore.
(91) H.W. Choi, S.J. Chua, X.H.Xu, Y.J. Sun, “Electrical Properties of Plasma Damaged n-GaN”, Proceedings of the International Workshop on Nitride Semiconductors (IWN2000), Nagoya, Japan, 2000, pp786-789.
(92) H.W. Choi, S.J. Chua, J.W. Chai, A. Raman, “Contrast Between ICP and RIE Plasma Exposed n-GaN”, Proceedings of the 25th International Conference on Physics of Semiconductors (ICPS25), Osaka, Japan, September 2000, pp1561-1562.
(93) J.H. Teng, S.J. Chua, W. Liu, X.C. Wang, H.W. Choi, J.R. Dong, G. Li and D. Braddoc, “Improved carrier transport in intermixed GaAs/AlGaAs laser structure with multi-quantum wells cladding” in Morphological and Compositional Evolution of Heteroepitaxial Semiconductor Thin Films, MRS Symposium Proceedings, Pittsburgh, 2000), Vol 618.
(94) H.W. Choi and S.J. Chua, A. Ramam “Flicker Noise Characteristics of Plasma-Induced Damaged GaN Planar Resistors”, presented at MRS Spring 2000.
(95) H.W. Choi and S.J. Chua, “Improvement of 1/f Noise Properties of n-GaN by ICP Plasma Exposure”, Proceedings of the International Workshop on Advances in Materials Science and Technology, Singapore (April 2000).
(96) H.W. Choi and S.J. Chua, “Flicker Noise Characterization of Plasma-Induced Damaged Gallium Nitride”, proceedings of the 5th International Semiconductor Device Research Symposium (ISDRS99), Charlottesville, USA (December 1999).
(97) H.W. Choi and S.J. Chua, “Lattice Dynamics Calculation of Zone-Centre Phonon Frequencies for Gallium Nitride”, proceedings of the 4th National Symposium on Progress in Material Research, Singapore (April 1998).