Institute of High Performance Computing

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IHPC Independent Investigatorship (I³)

Dr. KOH Wee Shing

Dr. KOH Wee Shing


Research Interests:

  • Intense electron beam-nanostructures interactions
  • Charged particle beam transport theory and particle-in-cell simulations
  • Computational vacuum micro- and nano-electronics
  • Nano-Photonics and Plasmonics
  • Solar cell design and simulation

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

    • Yu. A. Akimov and W. S. Koh, “Tolerance study of nanoparticle enhancement for thin-film silicon", Appl. Phys. Lett., 99, 063102 (2011). [Abstract]
    • 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, 84-21 (2011). [Abstract]
    • Yu. A. Akimov and W. S. Koh, “Design of plasmonic nanoparticles for efficient subwavelength light trapping in thin-film solar cells", Plasmonics, 6, 155-161 (2011). [Abstract]
    • 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). [Abstract]
    • 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) [also highlighted in Virtual Journal for Biomedical Optics, Vol. 5 Iss. 11, 25 Aug. 2010]. [Abstract]
    • Yu. A. Akimov and W. S. Koh, “Resonant and nonresonant plasmonic nanoparticle enhancement for thin-film silicon solar cells", Nanotechnology, 21, 235201 (2010). [Abstract]
    • O. Kurniawan, M. F. Ng, W. S. Koh, Z. Y. Leong and E.P. Li, “Simplified Model for Ballistic Current-Voltage Characteristic in Cylindrical Nanowires", Microelectronic Journal, 4, 155 (2010). [Abstract]
    • Wee Shing Koh and Yuriy Akimov, “Enhanced light trapping in thin-film solar cells", SPIE Newsroom (Solar & Alternative Energy), DOI: 10.1117/2.1201003.002654 (31 Mar 2010). [Full Text]
    • 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) [also highlighted in Virtual Journal of Nanoscale Science & Technology, Vol. 21 Iss. 9, 01 Mar. 2010]. [Abstract]
    • 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). [Abstract]
    • 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). [Abstract]
    • P. Zhang, W. S. Koh, L. K. Ang, and S. H. Chen, "Short pulse space-charge-limited electron flows in a drift space", Phys. Plasmas, 15, 063105 (2008). [Abstract]
    • W. S. Koh, and L. K. Ang, "Quantum model of space-charge-limited field emission in a nanogap", Nanotechnology, 19, 235402 (2008). [Abstract]
    • 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). [Abstract]
    • P. Bai, E. Li, K. T. Lam, O. Kurniawan, and W. S. Koh, "Carbon nanotube Schottky diode: an atomic perspective", Nanotechnology, 19, 115203 (2008). [Abstract]
    • 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). [Abstract]
    • W.S. Koh, and L. K. Ang, “Two-dimensional space-charge-limited flows in a crossed-field gap”, Appl. Phys. Lett., 90, 141503 (2007). [Abstract]
    • W.S. Koh, and L. K. Ang, “Transition of field emission to space-charge-limited emission in the nanometer scale”, Appl. Phys. Lett., 89, 183107 (2006). [Abstract]
    • 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). [Abstract]
    • L. K. Ang, W. S. Koh, Y. Y. Lau and T. J. T. Kwan. Space-charge-limited flows in the quantum regime, Phys. Plasmas; 13, 056701, May 2006 [INVITED PAPER]. [Abstract]
    • W. S. Koh, L. K. Ang, S. P. Lau and T. J. T. Kwan. Space-charge-limited bipolar flow in a nanogap, Appl. Phys. Lett.; 87, 193112 (2005). [Abstract]
    • W. S. Koh, L. K. Ang and T. J. T. Kwan. Three-Dimensional Child-Langmuir Law for hot electron emission, Phys. Plasmas; 12, 053107 (2005). [Abstract]
    • W. S. Koh and L. K. Ang, Simulation of high current field emission from vertically well-aligned metallic carbon nanotubes, Int. J. Nanoscience; 3, Nos. 4 & 5, 677-684 (2004). [Abstract]

Conferences

    • 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 Photonic West Symposium OPTO, Proc. SPIE 8619, Physics and Simulation of Optoelectronic Devices XXI, 861919 (2013). [Abstract]
    • W. S. Koh, S. H. Chen and L. K. Ang, "Plasma for Plasmonics", 39th IEEE International Conference on Plasma Science, 3P-28 (2012). [Abstract]
    • W.-J. Ding, B. Hao, Z.-M. Shen, C. Ren and W. S. Koh, "Collisional Effects on Relativistic Electron Beams Transportation in Warm Plasma", 39th IEEE International Conference on Plasma Science, IP-180 (2012). [Abstract]
    • W. S. Koh, S. H. Chen and L. K. Ang, "Particle-in-cell simulation of plasmonic nanoparticle", 38th IEEE International Conference on Plasma Science, IP2B-11 (2011). [Abstract]
    • 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), Symposium R, R4-7 (2011).
    • 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", 12th IEEE International Vacuum Electronics Conference, pp. 419-420 (2011). [Abstract]
    • Yu. A. Akimov and W.S. Koh, "Optimization of light-trapping in thin-film solar cells enhanced with plasmonic nanoparticles", Photonic Global Conference, 2-2D-5 (2010). [Abstract]
    • W. Chandra, L. K. Ang and W. S. Koh, "High current electron emission and injection in a gap with both vacuum and solid", 8th International Vacuum Electron Source Conference and Nanocarbon (IVESC), pp. 37-38 (2010). [Abstract]
    • S. Sun, L. K. Ang and W. S. Koh, "Space-charge-limited field emission from a single sharp field emitter", 8th International Vacuum Electron Source Conference and Nanocarbon (IVESC), pp. 152-153 (2010). [Abstract]
    • M. Pant, L. K. Ang and W. S. Koh, "Quantum shot noise reduction for electron field emission from different shapes", 8th International Vacuum Electron Source Conference and Nanocarbon (IVESC), pp. 266-267 (2010). [Abstract]
    • W. S. Koh, Yu. A. Akimov, Y. Li, M. S. Soh, W. P. Goh and H. S. Chu, "Plasmon-Enhanced Light Absorption in Thin-Film Amorphous Silicon Solar Cells", OSA Topical Meeting, Optics for Solar Energy (SOLAR), SWA-Light Trapping and Plasmonics, SWA3 (2010). [Abstract]
    • 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) Symposium G, pp. 9. (2009)
    • Yu. A. Akimov and W. S. Koh, Plasmon-Enhanced Light Absorption in Thin-Film Amorphous Silicon Solar Cells, 34th IEEE Photovoltaic Specialists Conference (PVSC), Area 5, pp. 605-607 (2009). [Abstract]
    • L.-C. Tai, P. Zhang, W. S. Koh, L. K, Ang and S.-H. Chen, "The Effect of the Self-Magnetic Field on the Current Limit in a Laser Wakefield Accelerator (LWFA)", 50th Annual Meeting of the Division of Plasma Physics, APS(DPP), PP6.00056 (2008). [Abstract]
    • L. Wu, L. K. Ang and W. S. Koh, “Nonequilibrium model of ultrafast laser induced electron emission from a dc-biased metallic surface”, 50th Annual Meeting of the Division of Plasma Physics, APS(DPP), TO3.00006 (2008). [Abstract]
    • W. S. Koh, L. K. Ang, S.-H. Chen, L.-C. Tai and L. Wu, “2D limiting current of a finite-width electron pulse in a parallel-plate gap”, 50th Annual Meeting of the Division of Plasma Physics, APS(DPP), UP6.00083 (2008). [Abstract]
    • L. Wu, L. K. Ang and W. S. Koh, “Low temperature refrigeration by using thermal-field emission in a coaxial cylindrical diode”, 50th Annual Meeting of the Division of Plasma Physics, APS(DPP), YP6.00055 (2008). [Abstract]
    • L. K. Ang, W. S. Koh, L. Wu and P. Zhang, "Space charge limited electron field emission in quantum and ultrafast regimes", 2008 The Seventh International Vacuum Electron Sources Conference (IVESC2008), (2008) [INVITED].
    • P. Zhang, W. S. Koh and L. K. Ang, "Space-Charge-Limited Electron Flow in a Drift Space", 2007 Pulsed Power and Plasma Science Conference (PPPS2007), (2007). [Abstract]
    • W. S. Koh and L. K. Ang, "Influence of Image Charge Potential on High Current Field Emitted Electron Flows in a Nano-Diode", 2007 Pulsed Power and Plasma Science Conference (PPPS2007), (2007). [Abstract]
    • W. S. Koh and L. K. Ang, "Two-dimensional limiting current in a crossed-field gap", The Joint 19 International Vacuum Nanoelectronics Conference and 50th International Field Emission Symposium, PE03 (2006).
    • W. S. Koh and L. K. Ang, "Transition from Fowler-Nordheim to Chid-Langmuir Law in the quantum regime", The Joint 19 International Vacuum Nanoelectronics Conference and 50th International Field Emission Symposium, OE04 (2006).
    • W. S. Koh and L. K. Ang, "Cylindrical short-pulse Chid-Langmuir law", 47th Annual Meeting of the Division of Plasma Physics, APS(DPP), BP1.00094 (2005). [Abstract]
    • W. S. Koh and L. K. Ang, "Two-dimensional Short-Pulse Chid-Langmuir Law", The 32nd International Conference on Plasma Science (ICOPS), N05CH37707, 3P38, pp. 298 (2005). [Abstract]
    • W. S. Koh and L. K. Ang, "Bipolar Quantum Chid-Langmuir Law", The 32nd International Conference on Plasma Science (ICOPS), N05CH37707, 1B2, pp. 98 (2005). [Abstract]
    • L. K. Ang and W. S. Koh, "3D Model of Chid-Langmuir Law", The 31st International Conference on Plasma Science (ICOPS), N04CH37537, 4P17, pp. 283 (2004). [Abstract]
    • W. S. Koh and L. K. Ang, "Investigation of Field Enhancement of Aligned Field Emitter Array", International Conference on Materials for Advanced Technologies (ICMAT) Syposium N1, N1-4-7, pp. 612 (2003).


This page is last updated at: 20-MAY-2013