Credentials
Education
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Doctor of Philosophy, Physics
1984: Cornell University
Specialization: Solid State Physics
Masters of Science, Physics
1982: Cornell University
Masters of Science, Physics
1978: Indian Institute of Technology, Bombay
Professional Appointments
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Faculty appointments:
2010- Adjunct Professor of Electrical & Computer Engineering; Physics & Astronomy
2004-2010 Adjunct Associate Professor of Electrical Engineering
1993-2010: Adjunct Associate Professor of Physics
P&S appointments:
2019- present: Senior Scientist IV, Microelectronics Res Ctr. & Ames Laboratory
2013-19 present: Senior Scientist, Ames Laboratory & Microelectronics Res Ctr
1998-2012: Scientist, Ames Laboratory & Microelectronics Research Center
1989-1998: Associate Scientist, Ames Lab & Microelectronics Research Center
Exxon Research & Engineering Company
Annandale, New Jersey: 1986-1988; Consultant
AT&T Bell Laboratories
Murray Hill, New Jersey: 1984-1986
Postdoctoral Member of Technical Staff,
Solid State Electronics Laboratory
Xerox Palo Alto Research Center
Palo Alto, California: 1983-84
Consultant
Honors & Awards
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• Lifetime Fellow, American Physical Society; For theoretical contributions to the dynamics of semiconductors, solar materials, and photonic crystals, (Elected November 2009)
• Senior Member, IEEE (Elected April 2015).
• Iowa State University P&S Research Award, 2011; To recognize staff members for excellence in research
Areas of Expertise
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• Electronic properties of semiconductor materials with ab-initio simulations.. Molecular dynamics. Structure and light-induced properties of thin film semiconductor materials and quantum information materials.
• Architectures for neuromorphic computing utilizing two-dimensional semiconductor materials
• Design, fabrication and characterization of photonic band gap crystals. Plasmonic crystals
• Nanofabrication, nano-litholithography and surface tribocharge.
• Light management in inorganic and organic solar cell structures and modules.
Research
Research Interests
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-Electronic properties of nanomaterials with ab-initio simulations
-Fabrication and characterization of nanostructures, especially surface tribocharging
- Photonics and plasmonic crystals
- Thin film soilar cells and solar materials
Patents
- U.S. Patent 5,406,573. April 11, 1995, “Periodic dielectric structure for production of photonic band gap and method for fabricating the same” E. Ozbay, G. Tuttle, E. Michel, K.M. Ho, R. Biswas, C.T. Chan, and C.M. Soukoulis
- U.S. Patent 06339030. January, 2002 “Method for fabricating photonic band gap crystals using ceramic processing techniques” K. Constant, G. Subramania, R. Biswas, K.-M. Ho,
- U.S. Patent 6,593,894 July 15, 2003; “Highly directional Antennas using photonic band gap crystals” R. Biswas, E. Ozbay, B. Temelkuran, M. Sigalas, G. Tuttle, K.M. Ho: full patent filed 9/26/2001.
- U.S. Patent 8,361,545 B2, Jan 29, 2013, "Manufacturing Method of Photonic Crystal," In Sung Park, Tae Ho Lee, Jin Ho Ahn, K. Constant, R. Biswas, K. M. Ho, Jae-Hwang Lee. (Assignees: Hanyang University & Iowa State University.)
Publications
Chlorination of Hydrogenated Silicon Nanosheets Revealed by Solid-State NMR Spectroscopy
Chemistry of Materials 35, 2, 539–548.,
2023
Site-Specific Sodiation Mechanisms of Selenium in Microporous Carbon Host
Nano Lett. 20, 2, 918–928,,
2020
OLEDs on Planarized Light Outcoupling-Enhancing Structures in Plastic
Organic Electronics 111, 106648,,
2022
Relativistic DFT Calculations of Cadmium and Selenium Solid-State NMR Spectra of CdSe Nanocrystal Surfaces
ACS Omega 8, 46, 44362–44371,,
2023
Patterned OLEDs: Effect of Substrate Corrugation Pitch and Height
Physica Scripta 98, 115540 (2023),
2023
Size control of Si nanocrystal with visible photoluminescence in a-Si:H/nc-Si:H multilayer structures
2020 47th IEEE Photovoltaic Specialists Conference (PVSC), 0786-0788,
2020
Simulation of enhanced light extraction from periodic, disordered and quasi-periodic OLED structures
J. Opt. Soc. Am. B. 38 (9) pp. C144-C152,
2021
High light outcoupling efficiency from periodically corrugated OLEDs
ACS Omega 6, 13, 9291–9301,
2021
Defects in SiC for quantum computing
MRS Advances, Volume 4, Issue 40 (Quantum and Nanomaterials), 2217-2222.,
2019
Visible photoluminescence in a-Si:H/nc-Si:H superlattices
J Mater Sci: Mater. Electron. 30: 4696-4704,,
2019
Spatial–temporal spectroscopy characterizations and electronic structure of methyl ammonium perovskites
MRS Communications 8(3), 961-969,,
2018
Replica molding-based nanopatterning of tribocharge on elastomer with application to electrohydrodynamic nanolithography
Nature Communications 9, 974,
2018
Nanoscale Modulation of Friction and Triboelectrification via Surface Nanotexturing
ACS Nano Letters 19, 2, 850-856,
2019
Enhanced Light Extraction from OLEDs fabricated on plastic substrates
Adv. Optical Materials 6 (4), 1701244,
2018
Photoluminescence enhancement of CuInS2 quantum dots in solution coupled to plasmonic gold nanocup arrays
Small 13 (33) 1613-6810,,
2017
Light management in perovskite solar cells and organic LEDs with microlens arrays
Optics Express 25 (9), 10704-10709,
2017
Nano-photonic light trapping near the Lambertian limit in organic solar cell architectures
Optics Express 21, Iss. S5, pp. A841–A846,
2013
Gallium nitride-based logpile photonic crystals for visible lighting
SPIE MOEMS-MEMS, Vol. 8249, 82490V-1 -82490V-6,
2012
Emission enhancement in nanowire arrays
Optics Communications, 287,250-253,
2012
Extremely efficient indium-tin-oxide-free green phosphorescent organic light-emitting diodes
Advanced Materials 24, 1-6,,
2012
Monolithic fabrication of multi-color organic light emitting diodes by controlled MoO3 layers
Appl. Phys. Lett. 99, 093305,,
2011
Nano-crystalline silicon solar cell architecture with absorption at the classical 4n2 limit
Optics Express, 19, A664-A672,,
2011
Simulations of emission from micro-cavity tandem organic light emitting diodes
Journal of Photonics for Energy (JPE) 1, 011016,
2011
Simulation and modeling of photonic and plasmonic crystal back reflectors for efficient light trapping
Phys. Status Solidi A 207, No. 3, 667,,
2010
A planar four-port channel drop filter in the 3-d woodpile photonic crystal
Optics Express 17, 6128-6133,,
2009
Waveguide bends and circuits in three-dimensional photonic crystals
Photonics and Nanostructures 6, 208,,
2008
Add-drop filters in 3-dimensional layer-by-layer photonic crystals using waveguides and resonant cavities
Appl. Phys. Lett. 89, 231103,
2006
Photonic gaps of conformally coated structures
J. Optical Society of America B 22, 2728,,
2005
All metallic absolute photonic band gap three-dimensional photonic crystals for energy applications
Nature 417, 52 - 55,
2003
Three-dimensional photonic band gaps in modified simple cubic lattices
Phys. Rev. B. 65, 205121,,
2002
Structural characterization of thin film photonic crystals
Phys. Rev. B. 63, 235111,,
2001
Guiding, bending, and splitting of electromagnetic waves in highly confined photonic crystal waveguides
Phys. Rev. B 63, 081107(R),
2001
A complete three-dimensional photonic band gap in a simple cubic system
J. of the Optical Society of America B. 18, 32,,
2001
Inverse face-centered cubic thin film photonic crystals
Advanced Materials 13, 443-446,
2001
Photonic band gaps in three-dimensional metallic lattices
Phys. Rev. B 62, 15299,,
2000
Synthesis of thin film photonic crystals
Synthetic Metals 116, 445-448,,
2001
Photonic band gaps of porous solids
Physical Review B 61, 4549,,
2000
Optical Photonic crystals fabricated from colloidal systems
Appl. Phys. Lett. 74, 3933,,
1999
A Three-dimensional photonic crystal operating at infrared wavelengths
Nature 394, 251-253,,
1997