Institute of High Performance Computing

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Electronics & Photonics (EP)

Dr. KOH Wee Shing

Dr. KOH Wee Shing


Research Interests:

  • Nano-Photonics and Plasmonics
  • Solar cell design and optoelectronic device physics
  • Plasma and particle-in-cell simulations
  • Urban environmental & green building modeling - solar irradiance & daylighting

Qualifications:

  • PhD., Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 2007
  • B.Eng. (Honours), Electrical and Electronic Engineering, Nanyang Technological University, 2002

Published Journals/ Articles:

Journals

    • Y.-L. Liu, S. H. Chen, W. S. Koh, and L. K. Ang, “Two-dimensional relativistic space charge limited current flow in the drift space", Phys. Plasmas, 21, 043101 (2014).
    • W. S. Koh, C. H. Gan, W. K. Phua, Yu. A. Akimov and P. Bai, “The potential of graphene as an ITO replacement in organic solar cells: An optical perspective”, IEEE J. Quantum Electron., 20, 36-42 (2014).
    • W. J. Ding, Z. M. Sheng and W. S. Koh, “High-field half-cycle terahertz radiation from relativistic laser interaction with thin solid targets”, Applied Physics Letters, 103, 204107 (2013).
    • S. H. Chen, L. C. Tai, Y. L. Liu, L. K. Ang, and W. S. Koh, “Two-dimensional electromagnetic Child–Langmuir law of a short-pulse electron flow", Phys. Plasmas, 18, 023105 (2011).
    • Yu. A. Akimov and W. S. Koh, “Design of plasmonic nanoparticles for efficient subwavelength light trapping", Appl. Phys. Let., 99, 063102 (2011).
    • Yu. A. Akimov and W. S. Koh, “Tolerance sudy of nanoparticle enhancement for thin-film silicon solar cell", Appl. Phys. Let., 99, 063102 (2011).
    • W. S. Koh, M. Pant, Yu. A. Akimov, W. P. Goh and Y. Li, “Three-Dimensional Optoelectronic Model for Organic Bulk Heterojunction Solar Cells, IEEE Journal of Photovoltaics, 1, 84-92 (2011).
    • Wee Shing Koh and Yu. A. Akimov, “Solar & Alternative Energy: Enhanced light trapping in thin-film solar cells”, SPIE Newsroom(31 Mar 2010). [INVITED ARTICLE]
    • O. Kurniawan, M. F. Ng, W. S. Koh, Z. Y. Leong, E. Li, “Simplified model for ballistic current-voltage characteristic in cylindrical nanowires”, Microelectronics Journal 41, 155-161 (2010).
    • L. Wu, H. S. Chu, W. S. Koh and E. P. Li, “Highly sensitive graphene biosensors based on surface plasmon resonance", Optics Express, 18, 14395 (2010).
    • Yu. A. Akimov and W. S. Koh, “Resonant and nonresonant plasmonic nanoparticle enhancement for thin-film silicon solar cells", Nanotechnology, 21, 235201 (2010).
    • Yu. A. Akimov, W. S. Koh, S. Y. Sian and S. Ren, “Nanoparticle-enhanced thin film solar cells: Metallic or dielectric nanoparticles?", Appl. Phys. Lett., 96, 073111 (2010).
    • Yu. A. Akimov, W. S. Koh and K. Ostrikov, “Enhancement of optical absorption in thin-film solar cells through the excitation of higher-order nanoparticle plasmon modes", Opt. Exp., 17, 10195-10205 (2009).
    • W. Chandra, L. K. Ang, and W. S. Koh, “Two-dimensional model of space charge limited electron injection into a diode with Schottky contact", J. Phys. D: Appl. Phys., 42, 055504 (2009).
    • W. S. Koh, and L. K. Ang, “Quantum model of space-charge-limited field emission in a nanogap”, Nanotechnology, 19, 235402 (2008).
    • L. Wu, L. K. Ang and W. S. Koh, “Theory of shot noise in high-current space-charge-limited field emission”, Physical Review B, 77, 115351 (2008).
    • P. Bai, E. Li, K. T. Lam, O. Kurniawan, and W. S. Koh, “Carbon nanotube Schottky diode: an atomic perspective”, Nanotechnology, 19, 115203 (2008).
    • H. S. Chu, W. B. Ewe, W. S. Koh, and E. P. Li, “Remarkable influence of the number of nanowires on plasmonic behaviors of the coupled metallic nanowire chain”, Appl. Phys. Lett., 92, 103103 (2008).
    • W. S. Koh, and L. K. Ang, “Two-dimensional space-charge-limited flow in a crossed-field gap”, Appl. Phys. Lett., 90, 141503 (2007).
    • W. S. Koh, L. K. Ang, S. P. Lau and T. J. T. Kwan, "Transition of field emission to space-charge-limited emission in a nanogap, Appl. Phys. Lett., 89, 183107 (2006).
    • W. S. Koh, L. K. Ang, S. P. Lau and T. J. T. Kwan, "Multi-dimensional Short-pulse Space-charge-limited Flow”, Phys. Plasmas, 13, 063102 (2006)
    • L. K. Ang, W. S. Koh, Y. Y. Lau and T. J. T. Kwan, "Space-charge-limited flows in the quantum regime", Physics of Plasmas, 13, 056701 (2006) [INVITED PAPER]
    • W. S. Koh, L. K. Ang, S. P. Lau and T. J. T. Kwan, "Space-charge-limited bipolar flow in a nano-gap", Applied Physics Letters, 87, 193112 (2005).
    • W. S. Koh, L. K. Ang and T. J. T. Kwan, "Three-Dimensional Child-Langmuir Law for hot electron emission", Physics of Plasmas, 12, 053107 (2005).
    • W. S. Koh and L. K Ang, “Simulation of high current field emission from vertically well-aligned metallic carbon nanotubes”, International Journal of Nanoscience 3 , 677-684 (2004).

Conferences

    • W. S. Koh, “Particle-in-cell simulations for laser-plasma applications", International Conference on Plasma Science and Applications (ICPSA2013), Singapore, 4-6 Dec 2013, Contrib. I44. (INVITED)
    • W. J. Ding, W. S. Koh, and , Z. M. Sheng, “Intense THz radiation by laser illuminated solid targets", IEEE Pulsed Power and Plasma Science Conference (PPPS), San Franciso, USA, 16-21 Jun 2013, Contrib. 10E-3.
    • Y. L. Liu, S. H. Chen and W. S. Koh, “Two-Dimensional Space Charged Limiting Current Density of a Long-Pulse Electron Flow in Drift Space", IEEE Pulsed Power and Plasma Science Conference (PPPS), San Franciso, USA, 16-21 Jun 2013, Contrib. 5F-8.
    • W. J. Ding and W. S. Koh, “Development of Particle-in-Cell Codes at IHPC", IEEE Pulsed Power and Plasma Science Conference (PPPS), San Franciso, USA, 16-21 Jun 2013, Contrib. P4-5.
    • W.S. Koh, Yu. A. Akimov, and W. P. Goh “3D full-wave optical and electronic modeling of organic bulk-heterojunction solar cells: A predictive approach”, SPIE Photonics West, San Francisco, USA, 2-7 Feb 2013, OPTO & Green Photonics Symposium, Contrib. 8619-43.
    • W. S. Koh, S. H. Chen and L. K. Ang, “Plasma for plasmonics", The 39th IEEE International Conference on Plasma Science Conference (ICOPS), Edinburgh, UK, 8-12 Jul 2012, Contrib. 3P-28.
    • W. J. Ding, B. Hao, Z. M. Sheng, C. Ren and W. S. Koh, “Plasma for plasmonics", The 39th IEEE International Conference on Plasma Science Conference (ICOPS), Edinburgh, UK, 8-12 Jul 2012, Contrib. 1P-180.
    • W. S. Koh, M. Pant, Yu. A. Akimov, and W. P. Goh, “Device modeling for organic bulk heterojunction solar cell”, International Conference on Materials for Advanced Technologies (ICMAT 2011), Singapore, 26 June - 1 July 2011. Symposium R: Flexible Electronics Materials and Device Physics, Contrib. R4-7.
    • W. S. Koh, S. H. Chen, L. K. Ang, “Particle-in-cell simulation of plasmonic nanoparticle", The 38th IEEE International Conference on Plasma Science Conference (ICOPS) and 24th Symposium on Fusion Engineering (SOFE), Chicago, USA, 26-30 Jun 2011, Contrib. IP2B-11.
    • Y. L. Liu, L. C. Tai, S. H. Chen, L. K. Ang and W. S. Koh, “Two-dimensional electromagnetic Child-Langmuir law of a short-pulse electron flow", 2011 IEEE International Vacuum Electronics Conference (IVEC), Bangalore, India, 21-24 Feb 2011, Contrib. 419-420.
    • Yu. A. Akimov and W. S. Koh, “Optimization of light-trapping in thin-film solar cells enhanced with plasmonic nanoparticles”, Photonics Global Conference 2010, Singapore, 14-16 December 2010, Contrib. 2-2D-5.
    • M. Pant, L. K. Ang and W. S. Koh, "Quantum shot noise reduction for electron field emission from different shapes", 2010 8th International Vacuum Electron Sources Conference and Nanocarbon (IVESC), Nanjing, China, 14-16 Oct 2010, Contrib. 266-267.
    • S. Sun, L. K. Ang and W. S. Koh, "Space charge limited field emission from a single sharp field emitter", 2010 8th International Vacuum Electron Sources Conference and Nanocarbon (IVESC), Nanjing, China, 14-16 Oct 2010, Contrib. 152-153.
    • W. Chandra, L. K. Ang and W. S. Koh, "High current electron emission and injection in a gap with both vacuum and solid", 2010 8th International Vacuum Electron Sources Conference and Nanocarbon (IVESC), Nanjing, China, 14-16 Oct 2010, Contrib. 37-38.
    • W. S. Koh, Yu.A. Akimov, Y. Li, M.S. Soh, W.P. Goh, and H.S. Chu, "Optical enhancement with plasmonic nanoparticles in organic bulk-heterojunction solar cells", Imaging and Applied Optics: OSA Optics & Photonics Congress, Tucson, USA, 7-9 June 2010, Topical Meeting: Optics for Solar Energy, Contrib. SWA3.
    • Yu. A. Akimov, W. S. Koh, and E. P. Li, "Surface plasmon enhancement of thin-film amorphous silicon solar cells", International Conference on Materials for Advanced Technologies (ICMAT 2009), Singapore, 29 Jun-3 Jul 2009, Symposium G: Plasmonics and Applications, Book of Abstracts, p. 9.
    • Yu. A. Akimov and W. S. Koh, "Plasmon-enhanced light absorption in thin-film amorphous silicon solar cells", 34th IEEE Photovoltaic Specialists Conference (PVSC), Philadelphia, USA, 7-12 Jun 2009, Contrib. BQ4-101.

This page is last updated at: 19-SEP-2014