A listing of publications by the “University Center of Excellence in Photovoltaics” at Georgia Institute of Technology.
Contents:
- Refereed Journal Publications
- Papers in Conference Proceedings (refereed)
- Papers in Conference Proceedings (non-refereed)
- Patents and Patent Disclosure Awards
-
Refereed Journal Publications
1992 / 1993 / 1994 / 1995 / 1996 / 1997 / 1998 / 1999 / 2000
- G. Augustine, N.M. Jokerst and A. Rohatgi, “Base Doping Optimization for
Radiation Hard Si, GaAs, and InP Solar Cells”, IEEE Transactions on Electron
Devices, vol. 39, no. 10, pp. 2395-2400, October 1992. - G. Augustine, N.M. Jokerst, and A. Rohatgi, “Single-Crystal Thin Film InP:
Fabrication and Absorption Measurements”, Applied Physics Letters, vol. 61,
no. 12, pp. 1429-1431, September 1992. - A. Rohatgi, “A Study of Efficiency Limiting Defects in Polycrystalline
CdTe/CdS Solar Cells”, International Journal of Solar Energy, vol. 12, pp.
37-49, 1992. - A. Rohatgi, A. Bhat, and H.C. Chou, “An Improved Understanding of
Efficiency Limiting Defects in Polycrystalline CdTe/CdS Solar Cells”,
American Institute of Physics Conference Proceedings #268. Photovoltaic Advanced Research
and Development Project, R. Noufi ed., pp. 243-249, October 1992. - A. Rohatgi, P. Sana, Z. Chen, and J. Salami, “Approach Towards High
Efficiency Polycrystalline Silicon Solar Cells”, American Institute of
Physics Conference Proceedings #268. Photovoltaic Advanced Research and Development
Project, R. Noufi ed., pp. 413-420, October 1992. - W.A. Doolittle and A. Rohatgi, “A Novel Computer Based Pseudo-Logarithmic
Capacitance/Conductance DLTS System Specifically Designed for Transient Analysis”,
Reviews of Scientific Instruments, vol. 63, no. 12, pp. 5733-5741, December 1992.
1992 / 1993
/ 1994 / 1995 / 1996
/ 1997 / 1998 / 1999 / 2000- A. W. Smith and A. Rohatgi, “Reevaluation of the Derivatives of the Half
Order Fermi Integrals”, Journal of Applied Physics, vol. 73,no. 11, pp.
7030-7034, June 1993. - A. W. Smith and A. Rohatgi, “Non Isothermal Extension of the
Scharfetter-Gummel Technique for Lot Carrier Transport in Heterostructure
Simulations”, IEEE Transactions on Computer-Aided Design of Integrated
Circuits and Systems, vol. 12, No. 10, pp. 1515-1513, October 1993. - A.W. Smith and A. Rohatgi, “A New Texturing for Producing High Efficiency
Solar Cells with No Antireflection Coatings”, Solar Energy Materials and
Solar Cells, vol. 29, pp. 51-65, 1993. - A.W. Smith and A. Rohatgi, “Ray Tracing Analysis of the Inverted Pyramid
Texturing Geometry for High Efficiency Silicon Solar Cells, Solar Energy Materials and
Solar Cells”, vol. 29, pp. 37-49, 1993. - A. Rohatgi, E. R. Weber, and L.C. Kimberling, “Opportunities in Silicon
Photovoltaics and Defect Control in Photovoltaic Materials”, Journal of
Electronic Materials, vol. 22, no. 1, pp. 65-72, 1993. - P. Sana, J. Salami, and A. Rohatgi, “Fabrication and Analysis of High
Efficiency Polycrystalline Silicon Solar Cells”, IEEE Transactions in
Electron Devices, vol. 40, no. 8, pp. 1461-1468, August 1993. - Z. Chen, P. Sana, J. Salami, and A. Rohatgi, “A Novel and Effective PECVD
SiO2/SiN Antireflection Coating for Si Solar Cells”, IEEE Transactions on
Electron Devices, vol. 40, no. 6, pp. 1161-1165, June 1993. - Z. Chen, S.K. Pang, K. Yasutake, and A. Rohatgi, “Plasma Enhanced Chemical Vapor
Deposited Oxide for Low Surface Recombination Velocity and High Effective Lifetime in
Silicon”, Journal of Applied Physics, vol. 74, no. 4, pp. 2856-2859, August 1993. - M.S. Ramanachalam, A. Rohatgi, W.B. Carter, J.P. Schaffer, and T.K. Gupta,
“Photoluminescence and PAS Study of ZnO Varistor Stability”, accepted for
publication in Journal of Applied Physics. - Z. Chen, K. Yasutake, A. Doolittle and A. Rohatgi, “Record Low SiO2/Si Interface
State Density for Low Temperature Oxides Prepared by Direct Plasma-Enhanced Chemical Vapor
Deposition”, Applied Physics Letters, vol. 63, no. 15, pp. 1-3, October 1993. - S.K. Pang and A. Rohatgi, “A New Methodology for Separating Schokley-Read-Hall
Lifetime and Auger Recombination Coefficients from Photoconductivity Decay Technique,
Journal of Applied Physics, vol. 74, no. 9, pp. 5554-5560, November 1993. - A. Rohatgi, Z. Chen, P. Sana, N. Evers, R. Ramanachalam and A. Doolittle,
“Gettering and Passivation Techniques for Quality Enhancement of Multicrystalline
Silicon”, American Institute of Physics Conference Proceedings #306. 12th Annual
Photovoltaics Review, pp. 505-518, October 1993. - A. Rohatgi, H.C. Chou, S. Kamra and A.K. Bhat, “Investigation of Efficiency
Limiting Defects and Rapid Thermal Processing of MOCVD Grown CdTe Solar Cells”,
American Institute of Physics Conference Proceedings #306. 12th Annual Photovoltaics
Review, pp. 354-363, October 1993.
1992 / 1993 / 1994 / 1995 / 1996 / 1997 / 1998 / 1999 / 2000
- H.C. Chou and A. Rohatgi, “The Impact of MOCVD Growth Ambient on Carrier Transport,
Defects, and Performance of CdTe/CdS Heterojunction Solar Cells”, Journal of
Electronic Materials, vol. 23, no. 1, pp. 1-7, January 1994. - K. Yasutake, Z. Chen, S.K. Pang and A.Rohatgi, “Modeling and Characterization of
Interface State Parameters and Surface Recombination Velocity at Plasma Enhanced Chemical
Vapor Deposited SiO2-Si Interface”, Journal of Applied Physics, vol. 75, no. 4, pp.
2048-2054, February 1994. - P. Sana and A. Rohatgi, “Gettering and Hydrogen Passivation of EFG Multicrystalline
Silicon Solar Cells by Al Diffusion and Forming Gas Anneal”, Applied Physics Letters,
vol. 64, no. 1, pp. 97-99, January 1994. - W.A. Doolittle and A. Rohatgi, “A New Figure of Merit and Methodology for
Quantitatively Determining Defect Resolution Capabilities in Deep Level Transient
Spectroscopy Analysis”, Journal of Applied Physics, vol. 75, no. 9., pp. 4570-4575,
May 1994. - W.A. Doolittle and A. Rohatgi, “Comparison of Covariance Linear Predictive
Modelling to the Modulation Function Method for Use in Deep Level Transient
Spectroscopy”, Journal of Applied Physics, vol. 75, no. 9., pp. 4560-4569, May 1994. - Z. Chen, A. Rohatgi, R.O. Bell and J.P. Kalejs, “Defect Passivation in
Multicrystalline-Si Materials by Plasma Enhanced Chemical Vapor Deposition of SiO2/SiN
Coatings”, Applied Physics Letters, vol. 65, no. 16, pp. 2078-2080, October 1994. - H.C. Chou, A.K. Bhat, S. Kamra and A. Rohatgi, “An Investigation of Photocurrent
Loss due to Reflectance and Absorption in CdTe/CdS Heterojunction Solar Cells”,
Journal of Electronic Materials, vol. 23, no. 7, pp. 681-686, July 1994. - A. Rohatgi, Z. Chen, P. Sana, J. Crotty, and J. Salami, “Gettering and Passivation
Techniques of High Efficiency Multicrystalline Silicon Solar Cells”, Solar Energy
Materials and Solar Cells, vol. 34, nos. 1-4, pp. 227-236, September 1994. - A. Rohatgi, Z. Chen, P. Doshi, T. Pham, and D. Ruby, “High Efficiency Silicon Solar
Cells by Rapid Thermal Processing,” Applied Physics Letters, vol. 65, no. 16, pp.
2087-2089, October 1994. - A. Rohatgi, Z. Chen, P. Sana, N. Evers, P. Lolgen, and R.A. Steeman, “Gettering and
Passivation for High Efficiency Multicrystalline Silicon Solar Cells,”accepted for
publication in OPTOELECTRONICS – Devices and Technologies, vol. 9, no. 4, pp.523-536,
December 1994. - C. Leguijt, P. Lolgen, J.A. Eikelboom, P.H. Amesz, R.A. Steeman, W.C. Sinke, P.M. Sarro,
L.A. Verhoef, P.-P. Michiels, Z.H. Chen and A. Rohatgi, “Very Low Surface
Recombination Velocities on 2.5 cm Si Wafers, Obtained With Low-Temperature PECVD of
Si-Oxide and Si-Nitride,” Solar Energy Materials and Solar Cells, vol. 34, nos. 1-4,
pp. 177-181, 1994.
1992 / 1993 / 1994 / 1995
/ 1996 / 1997 / 1998
/ 1999 / 2000- S.K. Pang, A. Rohatgi, and A.W. Smith, “Effect of Trap Location and Trap-Assisted
Auger Recombination on Silicon Solar Cell Performance”, accepted for publication in
IEEE Transactions on Electron Device, vol. 42, no.4, pp. 662-668, April 1995. - H.C. Chou, A. Rohatgi, E.W. Thomas, S. Kamra, and A.K. Bhat, “Effects of Cu on
CdTe/CdS Heterojunction Solar Cells with Cu/Au Contacts,” Journal of the
Electrochemical Society, vol. 142, no. 1, pp. 254-259, January 1995. - J.B. Lee, Z. Chen, M.G. Allen, and A. Rohatgi, “A Miniaturized High Voltage Solar
Cell Array as an Electrostatic MEMS Power Supply,” Journal of Microelectromechanical
Systems, vol. 4, no. 3, pp. 102-108, September 1995. - G. Augustine, A. Rohatgi, N.M. Jokerst and R. Dhere, “Concentration-Dependent Near
and Above Band Edge Absorption in Doped InP and Its Importance in Solar Cell
Modelling,” Journal of Applied Physics, vol. 78, no. 4, pp. 2666-2670, August 1995. - H.E. Elgamel, A.M. Barnett, A. Rohatgi, Z. Chen, C.Vinckler, J.Nijs, and R. Mertens,
“Efficient Combination Schemes of High Efficiency Multicrystalline Silicon Solar
Cells,” accepted for publication in Journal of Applied Physics, September 1995. - A.Rohatgi, H.C. Chou, N.M. Jokerst, E.W. Thomas, C. Ferekides, S. Kamra, Z.C. Feng, and
K.M.Dugan, “Effects of CdTe Growth Conditions and Techniques on the Efficiency
Limiting Defects and Mechanisms in CdTe Solar Cells,” AIP Conference Proceedings,353,
pp. 368-375, May 1995. - A.Rohatgi, P. Sana, L. Cai, W.A. Doolittle, S. Kamra, P. Doshi, T. Krygowski, and G.
Crotty, “Fabrication and Analysis of High Efficiency Multicrystalline Silicon Solar
Cells,” AIP Conference Proceedings, 353, pp. 126-133, May 1995. - B.L.Sopori, X. Deng, J.P. Benner, A.Rohatgi, P. Sana, S.K. Estreicher, Y.K. Park, M.A.
Roberson, “Hydrogen in Silicon: A Discussion of Diffusion and Passivation
Mechanisms” Solar Energy Materials & Solar Cells, 41/42, pp.159-169, July 1995. - L.Cai, and A.Rohatgi, “Effect of Post PECVD Photo-assisted Anneal on
Multicrystalline Silicon Solar Cells,” submitted for publication in IEEE Transactions
on Electron Devices, vol. 44, no. 1, pp. 97-103, August 1995. - H.C. Chou, A.Rohatgi, N.M.Jokerst, S.Kamra, S.R. Stock, S.L. Lowrie, R.K.Ahrenkiel and
D.H. Levi, “Approach Toward High Efficiency CdTe/CdS Heterojunction Solar
Cells,” Journal of Material Chemistry Physics, 43, pp. 178-182, May 1995. - H.C. Chou, A.Rohatgi, N.M. Jokerst,E.W. Thomas, and S.Kamra, “Copper Migration in
CdTe Hetereojunction Solar Cells,” IEEE Transactions on Electron Device, vol. 25, no.
7, pp.1093-1098, 1995. - S.S. Han, L.Cai, G. May, and A. Rohatgi, “Modeling the Growth of PECVD Silicon
Nitride Films for Polysilicon Solar Cell Applications Using Neural Networks,” IEEE
Transactions on Semiconductor Manufacturing, vol.9, no.3, pp. 303-311, August 1995.
1992 / 1993 / 1994 / 1995 / 1996
/ 1997 / 1998 / 1999 / 2000- P. Doshi, A. Rohatgi, M. Ropp, Z. Chen and D.L. Meier, “Rapid Thermal Processing of
High-Efficiency Silicon Solar Cells with Controlled In-Situ Anealing,” submitted for
publication in Solar Energy Materials and Solar Cells, vol. 41/42, pp. 31-39, 1996. - Z.C. Feng, G.K.Lim, H.C.Chou, A.T.S. Wee, A.Rohatgi, and K.L.Tan, “Correlations
Between the MOCVD-grown CdTe/CdS/SnO2/glass Solar Cell Efficiencies and the
Interface/Surface Properties,” Journal of Applied Physics, vol.79, no.4,
pg.2151-2153, February 1996.
- P.Doshi, J.Mejia,K.Tate,A.Rohatgi, “Integration of Screen-Printing and Rapid
Thermal Processing Technologies for Silicon Solar Cell Fabrication,” IEEE Electron
Device Letters, vol. 17, no. 8, pp. 404-409, August 1996. - A. Rohatgi and S. Narasimha, “Design, Fabrication, and Analysis of Greater than 18%
Efficient Multicrystalline Silicon Cells,”accepted for publication in Solar Cell and
Solar Energy Materials, November, 1996. - Z.C. Feng, A. Rohatgi, C.C. Tin, R-Hu, A.T.S. Wee, and K.P. Se, “Structural Optical
and Surface Science Studies of 4H-SiC Epilayers Grown by Low Pressure Chemical Vapor
Deposition,” Journal of Electronic Materials, vol. 25, pp. 917-923, 1996. - L.Cai, D. Yang, M.A. El-Sayed, and A.Rohatgi, “Effects of Rapid Thermal Anneal on
Refractive Index and Hydrogen Content of Plasma-Enhanced Chemical Vapor Deposited Silicon
Nitride Films,”Applied Physics Letters, vol. 80, no. 9, pp. 5384-5388, November,
1996. - L. Cai, S. Han, G. May, S. Kamra, T. Krygowski, and A. Rohatgi, ” Optimization of
Saturation Current Density of PECVD SiN Coated Phosphorus Diffused Emitters Using Neural
Network Modeling,” Journal of Electronic Materials, vol. 25, no. 11, pp. 1784-1789,
November 1996. - A. Rohatgi, S. Narasimha, S. Kamra, “Fabrication and Analysis of Record High 18.2%
Efficient Solar Cells on Multicrystalline Silicon Material,” IEEE Electron Device
Letters, vol. 17, no. 8, pp. 401-403, August 1996. - M. Ropp, M. Begovic, A. Rohatgi and R. Long, “Design Consideration for Large
Roof-Integrated Photovoltaic Arrays,” Progress in Photovoltaics, vol. 5, pp. 55-67,
September, 1996. - P. Doshi, J.Mejia, K. Tate and A. Rohatgi, “Modeling and Characterization of
High-Efficiency Silicon Solar Cells Fabricated by Rapid Thermal Processing, Screen
Printing, and Plasma Enhanced Chemical Vapor Deposition,” IEEE Transactions of
Electron Devices, vol. 44, no. 9, pp. 1417-1424, September, 1996. - A. Rohatgi, S. Narasimha and L. Cai, “Gettering and Passivation of High Efficiency
Multicrystalline Silicon Solar Cells,”American Institute of Physics Conference
Proceedings, vol. 394, pp. 199-213, November, 1996.
1992 / 1993 / 1994 / 1995 / 1996 / 1997 / 1998 / 1999 / 2000
- T. Krygowski, and A. Rohatgi, “A Novel Approach Towards the Simultaneous Diffusion
of Boron and Phosphorus in Silicon,” Journal of Electrochemical Society, vol. 144,
pp. 346-349, January, 1997. - P. Doshi, G.E. Jellison and A. Rohatgi, “Characterization and Optimization of
Absorbing PECVD Antireflection Coatings for Silicon Photovoltaics,” Journal of
Applied Physics, vol. 36, no. 30, pp. 7826-7837, October, 1997. - T. Krygowski and A. Rohatgi, “A Simultaneously Diffused Textured, In-Situ Oxide
AR-Coated Solar Cell Process for High Efficiency Silicon Solar Cells,”IEEE Electron
Devices Letters, vol. 45, no. 1, pp. 194-199, January 1997. - S. Narasimha and A. Rohatgi, “Fabrication and Characterization of Record High
Efficiency Solar Cells on Multicrystalline Silicon” submitted for publication IEEE
Transactions on Electron Devices, January, 1997. - P.Doshi and A. Rohatgi, “18% Efficient Silicon Photovoltaic Devices by Rapid
Thermal Diffusion and Oxidation,” submitted for publication in IEEE Transactions on
Electron Devices, February, 1997. - A. Rohatgi, P. Doshi and T. Krygowski, “Pushing the Frontiers of Silicon PV
Technologies: Novel Approaches to High Efficiency, Manufacturable Silicon Cells, American
Institute of Physics, March, 1997. - D. Ratakonda, R. Singh, L. Vedula, A. Rohatgi, J. Mejia, and S. Narayanan, “Rapid
Thermal Processing of Screen Printed Ohmic Contact,” vol. 144, no. 9 pp. 3237-3242,
Journal of Electrochemical Society, September, 1997. - S. Narasimha, G. Crotty, A. Rohatgi, and D. L. Meier, “Back Surface Field Effects
in the 17.3% Efficient n-type Dendritic Web Silicon Solar Cell,” submitted for
publication in Solid-State Electronics, November, 1997. - R.L. Wallace, J.I. Hanoka, A. Rohatgi and G. Crotty, “Thin Film String
Ribbon,” Solar Energy Materials and Solar Cells, vol. 48, pp. 179-186, November,
1997. - R. Singh, K.C. Cherukuri, L. Vedula, A. Rohatgi and S. Narayanan, “Low Temperature
Shallow Junction Formation Using Vacuum Ultraviolet Photons During Rapid Thermal
Processing,” vol. 70, no 13, pp. 1700-1702, March, 1997.
1992 / 1993 / 1994 / 1995 / 1996 / 1997 / 1998
/ 1999 / 2000- L. Cai, M. Zou, S. Han, G. May and A. Rohatgi, “Investigation of the Properties of
Plasma-Enhanced Chemical Vapor Deposited Silicon Nitride and Its Effect on Silicon Surface
Passivation,” vol. 83, no. 11, pp. 5885-5889, Journal of Applied Physics, June, 1998. - S. Narasimha and A. Rohatgi, “Effective Passivation of the Low Resistivity Silicon
Surface by a Rapid Thermal Oxide/Plasma Silicon Nitride Stack,” vol. 72, pp.
1872-1874, Applied Physics Letter, April, 1998. - M.E. Ropp, M. Begovic and A. Rohatgi, “Prevention of Islanding in Grid-Connected
Photovoltaic Systems,” submitted for publication in Journal of Progress in
Photovoltaics, February, 1998. - M.E. Ropp, M. Begovic, A. Rohatgi, “Analysis and Performance Assessment of the
Active Frequency Drift Method of Islanding Prevention,” submitted for publication in
IEEE Power Engineering Society, April, 1998. - D. Ratakonda, R. Singh, L. Vedula, A. Rohatgi, J. Mejia, and S. Narayanan, “Rapid
Thermal Processing of Screen Printed Ohmic Contact,” vol. 144, no. 9 pp. 3237-3242,
Journal of Electrochemical Society, September, 1997. - G.E. Jellison, Jr., F.A. Modine, P. Doshi, and A. Rohatgi, “Spectroscopic
Ellipsometry Characterization of Thin-Film Silicon Nitride,” pp. 193-197, Thin Solid
Films, July, 1998. - A. Rohatgi, P. Doshi, J. Moschner, T. Lauinger, A. Aberle and D. S. Ruby,
“Comprehsive Study of Rapid, Low-Cost Silicon Surface Passivation Technologies.”
submitted for publication in IEEE Transactions on Electron Devices, August, 1998.
1992 / 1993 / 1994 / 1995 / 1996 / 1997 / 1998 / 1999
/ 2000- A. Ebong, P. Doshi, S. Narasimha, A. Rohatgi J. Wang and M.A. El-Sayed, “The Effect
of Low and High Temperature Anneals on the Hydrogen Content and Passivation of Si Surface
Coated with SiO2 and SiN Films,” Journal of Electrochemical Society,
vol. 146, no. 5, pp. 1921-1924, May 1999. - T. Krygowski, A. Rohatgi and T. Selzer, “A Novel Processing Technology for High-
Efficiency Silicon Solar Cells,” Journal of the Electrochemical Society“,
vol. 146, no. 3, March 1999. - A. Rohatgi, S. Narasimha, P. Doshi, A. Ebong, and J. Moschner, “Rapid Thermal
Processing and Screen-Printing for Low Cost Silicon Solar Cells,” American
Institute of Physics, NCPV Photovoltaics Program Review, edited by M.
Al-Jassim, J.P. Thornton, and J.M. Gee, pp. 354-360, March 1999. - A. Rohatgi and J. Moschner, comments on “17.3% Efficiency Metal-Oxide-
Semiconductor (MOS) Solar Cells with Liquid-Phase-Deposited Silicon Dioxide” IEEE
Electron Device Letters, vol. 19, no. 11, pp 447, November 1998. - A. Rohatgi, S. Narasimha, A. Ebong and P. Doshi, “Understanding and Implementation
of Rapid Thermal Technologies for Low-Cost High-Efficiency Silicon Solar Cells,” IEEE
Transaction on Electron Devices vol. 46, no. 10, pp. 1970 – 1977, October, 1999.
- S. Narasimha, A. Rohatgi and A.W. Weeber, “An Optimized Rapid Aluminum Back Surface
Field Technique for Silicon Solar Cells,” IEEE Transaction on Electron Devices,
vol. 46, no. 7, pp. 1363-1370, July, 1999. - M. E. Ropp, M. Begovic, A. Rohatgi, G. Kern, R. Bonn, and S. Gonzalez, “Determining
the Relative Effectiveness of Islanding Detection Methods Using Phase Criteria and
Nondetection Zones,” submitted for publication in IEEE Transaction on Electron
Devices, March, 1999 - R. Singh, V. Parihar, S. Venkataraman, K.F. Poole, R.P.S. Thakur, and A. Rohatgi
“Changing from Rapid Thermal Processing to Rapid Photothermal Processing: What Does
It Buy for a Particular Technology?,” Materials Science in Semiconductor
Processing, pp. 219-230, 1999. - A. Rohatgi, “Fundamental Understanding and Development of High Quality
Screen-Printed Contacts for Silicon Solar Cells,” submitted for publication in Journal
of Electronic Materials, June, 1999. - J. B. Lee, M.G. Allen, and A. Rohatgi, ” Photovoltaic On-Demand Pulse Generator as
an On-Board Power Source for Electrostatic Actuator Array”, SPIE Symposium on
Micromachining and Microfabrication, Santa Clara, California, September 19-23, 1999. - A. Ebong, J. Brody, A. Rohatgi and T. Williams, “Optimization of Front Metal
Contact Firing Scheme To Achieve High Fill Factors On Screen Printed Silicon Solar
Cells,” submitted for publication in Solar Energy Materials and Solar Cells,
September, 1999 - D.L. Meier, H.P. Davis, R. A. Garcia, J. Salami, A. Rohatgi, A. Ebong, and P. Doshi
“Aluminum Alloy Back P-N Junction Dendritic Web Silicon Solar Cell,” submitted
for publication in Solar Energy Materials and Solar Cells, September, 1999. - S. Venkataraman, R. Singh, V. Parihar, K. F. Poole, A. Rohatgi, V. Yeludur, and A.Ebong,
“A Study of the Effect of Ultraviolet (UV) and Vacuum Ultra Violet (VUV) Photons on
the Minority Carrier Lifetime of Single Crystal Silicon Processed by Rapid Thermal and
Rapid Photothermal Processing,” submitted for publication in Journal of Electronic
Materials, , October, 1999.
1992 / 1993 / 1994 / 1995 / 1996 / 1997 / 1998 / 1999 / 2000
- A. Rohatgi, A. Ebong, V. Yelundur and A. Ristow, “Rapid Thermal Processing of Next
Generation Silicon Solar Cells,” submitted for publication in Progress in
Photovoltaics Research and Applications, January, 2000.
- G. Augustine, N.M. Jokerst and A. Rohatgi, “Base Doping Optimization for
-
Papers in Conference
Proceedings (refereed)- A. Rohatgi and R. Sudharsanan, “MOCVD of Compound Semiconductors for
Photovoltaics”, Proceedings of the 6th International Photovoltaic Science and
Engineering Conference, New Delhi, India, pp. 835-842, February 1992. - G. Augustine, N.M. Jokerst, and A. Rohatgi, “Absorption Measurements of Doped Thin
Film InP for Solar Cell Modeling”, Proceedings of the 4th International Conference on
Indium Phosphide Related Materials, New Port, Rhode Island, pp. 557-560, April 1992. - A. Rohatgi, P. Sana, and J. Salami, “Record High Efficiency Solar Cells on Cast
Polycrystalline Silicon”, 11th European Photovoltaic Solar Energy Conference,
Montreaux, Switzerland, pp. 159-163, October 1992. - G. Augustine, B.M. Keyes, N.M. Jokerst, A. Rohatgi, and R.K. Ahrenkiel,
“Time-Resolved Photoluminescence Studies on Transferred Thin Film InP
Epilayers”, to be published in Proceedings of the 5th International Conference on
Indium Phosphide Related Materials, Paris, France, April 1993. - P. Sana, A. Rohatgi, J.P. Kalejs, and R.O. Bell, “The Effect of Aluminum Treatment
and Forming Gas Anneal on EFG Silicon Solar Cells,” Proceedings of the 23rd IEEE
Photovoltaic Specialists Conference, Louisville, KY, pp. 111-116, May 1993. - H.C. Chou, A. Rohatgi, A.K. Bhat, S. Kamra, R.R. Arya, and R.K. Ahrenkiel, “The
Effects of CdTe Mole Ratio in the MOCVD Growth Ambient on CdTe Solar Cells,”
Proceedings of the 23rd IEEE Photovoltaic Specialists Conference, Louisville, KY, pp.
481-485, May 1993. - A. Rohatgi, P. Sana, M.S. Ramanachalam, and W. B. Carter, “Investigation of the
Effects of Aluminum Treatment on Silicon Solar Cells,” Proceedings of the 23rd IEEE
Photovoltaic Specialists Conference, Louisville, KY, pp. 52-57, May 1993. - A. Rohatgi, Z. Chen, G. Crotty, and J. Salami, “PECVD Passivation of High
Efficiency Multicrystalline Silicon Solar Cells,” Technical Digest of the 7th
International Photovoltaic Science and Engineering Conference, Nagoya, Japan pp. 93-97,
November 1993. - K. Yasutake, H. Kakiuchi, K. Yoshi, H. Kawabe, Z. Chen, S.K. Pang, and A. Rohatgi,
“Surface Recombination Velocity and Interface State Parameters at Si-Si02 Interface
Prepared by Low Temperature Plasma Processes,” Technical Digest of the 7th
International Photovoltaic Science and Engineering Conference, Nagoya, Japan, pp. 549-550,
November 1993. - C. Leguijt, P. Lolgen, J.A. Eikelboom, P.H. Amesz, R.A. Steeman, W.C. Sinke, P.M. Sarro,
L.A. Verhoef, P -P. Michiels, Z.H. Chen and A. Rohatgi, “Very Low Surface
Recombination Velocities on 2.5 cm Si Wafers, Obtained with Low- Temperature PECVD of
Si-oxide and Si-nitride,” Technical Digest of the 7th International Photovoltaic
Science and Engineering Conference, Nagoya, Japan, pp. 551-552, November 1993. - J.B. Lee, Z. Chen, M.G.Allen, A. Rohatgi and R. Arya, “A High Voltage Solar Cell
Array as an Electrostatic MEMS Power Supply”, Proceedings 7th IEEE Workshop on Micro
Electro Mechanical Systems, Oiso, Japan, pp. 331-336, January 1994. - P. Lolgen,, A. Rohatgi, P. Sana, W.C. Sinke, A.W. Weeber, C. Leguijt, R.A. Steeman, and
J.A. Eikelboom, “Al Treatment-Induced Improvement in Bulk Carrier Lifetime Measured
Independently from Surface Effects,” Proceedings of the 12th European Photovoltaic
Solar Energy Conference:Proceedings of the International Conference, Amsterdam, The
Netherlands, pp. 1778-1781, April 1994. - C. Leguijt, P. Lolgen, J.A. Eikelboom, A.S.H. van der Heide, R.A. Steeman, W.C. Sinke,
P.M. Sarro, L.A. Verhoef, P.P. Michiels, Z. Chen, and A. Rohatgi, “Surface
Passivation of Silicon by Low Temperature Processing,” Proceedings of the 12th
European Photovoltaic Solar Energy Conference: Proceedings of the International
Conference, Amsterdam, The Netherlands, pp. 720-723, April 1994. - J.B. Lee, Z. Chen, M.G. Allen, and A.Rohatgi, “A Hybrid Micro System Using a High
Voltage Solar Cell Array as a Power Supply”, Proceedings International Symposium on
Microelectronics ISHM 94, Boston PA, November 1994. - B.L. Sopori, X. Deng, J.P. Benner, A. Rohatgi, P.Sana, S. Estreicher, Y.K. Park, and
M.A. Roberson, “Hydrogen in Silicon: Current Understanding of Diffusion and
Passivation Mechanisms,” Proceedings of 1994 IEEE First World Conference on
Photovoltaic Energy Conversion: Conference Record of the Twenty-Fourth IEEE Photovoltaic
Specialists Conference, Waikoloa, Hawaii, Vol. II, pp. 1615-1620, December 1994. - H.E. Elgamel, A. Rohatgi, Z. Chen, C. Vinckier, S. Sivoththaman, J. Poortmans, J. Nijs,
and R. Mertens, “Optimal Surface and Bulk Passivation of High Efficiency
Multicrystalline Silicon Solar Cells,” Proceedings of 1994 IEEE First World
Conference on Photovoltaic Energy Conversion: Conference Record of the Twenty-Fourth IEEE
Photovoltaic Specialists Conference, Waikoloa, Hawaii, Vol. II, pp. 1323-1326, December
1994. - S. Narayanan, J. Creager, S. Roncin, A. Rohatgi, and Z. Chen, “Process Improvements
for Large Area Polycrystalline Silicon Buried Contact Solar Cells Sequence,”
Proceedings of 1994 IEEE First World Conference on Photovoltaic Energy Conversion:
Conference Record of the Twenty-Fourth IEEE Photovoltaic Specialists Conference, Waikoloa,
Hawaii, Vol. II, pp. 1319-1322, December 1994. - Z. Chen, A.Rohatgi and D. Ruby, “Silicon Surface and Bulk Defect Passivation by Low
Temperature PECVD Oxides and Nitrides,” Proceedings of the 1994 IEEE First World
Conference on Photovoltaic Energy Conversion: Conference Record of the Twenty-Fourth IEEE
Photovoltaic Specialists Conference, Waikoloa, Hawaii , Vol. II, pp.1331-1334, December
1994. - P. Doshi, A.Rohatgi, M.Ropp, Z.Chen, D.Ruby, D.L. Meier, “Rapid Thermal Processing
of High Efficiency Silicon Solar Cells with Controlled In-Situ Annealing,”
Proceedings of 1994 IEEE First World Conference on Photovoltaic Energy Conversion:
Conference Record of the Twenty-Fourth IEEE Photovoltaic Specialists Conference, Waikoloa,
Hawaii, Vol. II, pp. 1299-1302, December 1994. - H.C. Chou, A. Rohatgi, N.M. Jokerst, S. Kamra, S.R. Stock, S.L. Lowrie, R.K. Ahrenkiel,
and D.H.Levi, “Approach Toward High Efficiency CdTe/CdS Heterojunction Solar
Cells,” submitted for publication in Proceedings of the 1994 International Conference
on Electronic Material, Hsinchi, Taiwan, vol. 43, pp. 178-182, (also journal paper 98)
December 1994. - M.Begovic, A. Rohatgi, D. Nall, R. Long, “Power Quality and Design of the
Photovoltaic System at Georgia Tech Athletic Facility, ” Proceedings of the 4th
International Conference 1995. - A.Rohatgi, P.Doshi, M.Ropp, L.Cai, A. Doolittle, S. Narasimha, T.Krygowski, J.Rand,
D.Ruby, and D.L. Meir, “Improved Understanding and Optimization of RTP and PECVD
Processes for High Efficiency Silicon Solar Cells,” Proceedings of the 13th European
Photovoltaic Solar Energy Conference and Exhibition, vol. I, pp. 413-416, Nice, France,
October 1995. - M.Begovic, M.Ropp, A.Rohatgi, R.Long, “Roof-Installed PV System on the Olympic
Swimming Pool at Georgia Tech,” Proceedings of the 13th European Photovoltaic Solar
Energy Conference and Exhibition, vol. I, pp. 965-968, Nice, France, October 1995. - B.L. Sopori, M. Cuzdinovic, C.Khattak and A. Rohatgi, “Characterization of HEM
Multi-Crystalline Silicon Material for High Efficiency Solar Cells,” Proceedings of
13th European Photovoltaic Solar Energy Conference and Exhibition, October, 1995. - R.Long, A. Rohatgi, M. Begovic, “Photovoltaics in Architecture, The Design,
Construction and Monitoring of a Photovoltaic Power System on the Georgia Institute of
Technology Aquatic Center,” Proceedings of the 13th European Photovoltaic Solar
Energy Conference and Exhibition, vol. I, pp. 675-678, Nice, France, October, 1995. - P.Doshi, J.Mejia, K.Tate, S.Kamra, A.Rohatgi, M.Narayanan, and R.Singh, “High
Efficiency Large and Small Area Si Solar Cells Using Low-Cost Rapid Thermal Processing,
Screen-Printing, and Plasma-Enhanced Chemical Vapor Deposition,” Proceedings of the
25th IEEE Photovoltaic Specialists Conference, May 1996. - T.Krygowski, P.Sana, and A.Rohatgi, “A Novel Technology for the Simultaneous
Diffusion of Boron and Phosphorus In Silicon,” Proceedings of the 25th IEEE
Photovoltaic Specialists Conference, May 1996. - S.Narasimha, S.Kamra,A.Rohatgi and C.P.Khattak “The Optimization and Fabrication of
High-Efficiency HEM Multicrystalline Silicon Solar Cells,” Proceedings of the 25th
IEEE Photovoltaic Specialists Conference, May 1996. - A. Rohatgi, S. Narasimha, S. Kamra, P. Doshi, C.P. Khattak, K. Emery and H. Field
“Record High 18.6% Efficient Solar Cell on HEM Multicrystalline Material,”
Proceedings of the 25th IEEE Photovoltaic Specialists Conference, May 1996 - A.X.Coles, R.A.Gebhardt and A. Rohatgi, “Optimization of Porous Silicon Reflectance
for Solar Cell Applications,” Proceedings of the Materials Research Society, April,
1996. - R. Wallace, J.I. Hanoka, A. Rohatgi and G. Crotty, “100 Micron String Ribbon
Silicon,” Proceedings of the 9th International PV Science and Engineering Conference,
Miyazaki, Japan, November 1996. - R.Singh, A. Rohatgi, and D. Ratokonda, “Role of Rapid Isothermal Processing in the
Manufacturing of Bulk and Thin Film Solar Cells and Other Large Area Devices,”
Proceedings of the 4th International Conference on Advanced Thermal Processing of
Semiconductors RTP 96, Idaho, 1996. - S. Han, L.Cai, G. May, and A. Rohatgi, “Optimizing the Growth of PECVD Silicon
Nitride Films for Solar Cells Applications Using Neural Networks and Genetic
Algorithms,” Artificial Neural Networks in Engineering, St. Louis, Missouri, November
1996. - S.Han, L.Cai, G.May and A.Rohatgi, “Modelling and Optimization of PECVD Silicon
Nitride Using Neural Networks and Genetic Algorithms,” 190th Meeting of the
Electrochemical Society, San Antonio, Texas, October, 1996. - A. Rohatgi, and S. Narasimha, “Design, Fabrication, and Analysis of Greater than
18% Efficient Multicrystalline Silicon Cells,” 9th International Photovoltaic Science
and Engineering Conference, Miyazaki, Japan, November 1996. - M. Begovic, M. Ropp, and A.Rohatgi, “Roof-Installed Photovoltaic System at Georgia
Tech Olympic Aquatic Center,” Tesla the Third Millenium, Belgrade, Yugoslavia,
October 14-17, 1996. - R.L. Wallace, J.I. Hanoka, S. Narasimha, S. Kamra, and A. Rohatgi “String Ribbon –
Acrystal Growth Method to Make High Efficiency, 100 um Silicon Solar Cells,” 14th
European Photovoltaic Solar Energy Conference and Exhibition, Barcelona (Catalunya),
Spain, June 30 – July 4, 1997. - M. Ropp, M. Begovic, and A. Rohatgi, “Performance Evaluation of the Georgia Tech
Aquatic Center Photovoltaic Array,” 14th European Photovoltaic Solar Energy
Conference and Exhibition, Barcelona (Catalunya), Spain, June 30 – July 4, 1997. - A. Rohatgi, P. Doshi, and S. Kamra, “Highest Efficiency RTP Silicon Solar Cells by
Rapid Thermal Diffusion and Oxidation,” 14th European Photovoltaic Solar Energy
Conference and Exhibition, Barcelona (Catalunya), Spain, June 30 – July 4, 1997. - R. Singh, R. Sharangpani, K.C. Cherukuri, Y.Chen, D.M. Dawson, K.F. Poole, A. Rohatgi,
S.Narayanan and R.P.S. Thakur, “How Rapid Isothermal Processing Can Be A Dominant
Semiconductor Processing Technology In The 21st Century,” Material Research Society,
San Francisco, CA, April 8-12, 1996. - M. Begovic, M. Ropp, A. Rohatgi, S. Durand and A. Rosenthal, “Monitoring and Data
Acquisition For A Large Roof-Mounted Photovoltaic Array,” Southeast Region of the
IEEE Annual Conference, Blacksburg, Virginia, April, 1997. - T. F. Ciszek, T.H. Wang, W.A. Doolittle and A. Rohatgi, “Minority-Carrier Lifetime
Degradation in Silicon Co-Doped with Iron and Gallium,” Proceedings of the 26th IEEE
Photovoltaic Specialists Conference, pp. 59-62, Anaheim, California, September 29-October
4, 1997. - R. F. Wallace, J. I. Hanoka, S. Narasimha, S. Kamra and A. Rohatgi, “thin Silicon
Ribbon for High Efficiency Polycrystalline Solar Cells,” Proceedings of the 26th IEEE
Photovoltaic Specialists Conference, pp. 99-102, Anaheim, California, September 29 –
October 4, 1997. - S. Narasimha, G. Crotty, T. Krygowski, A. Rohatgi and D. L. Meier, “Back Surface
Field and Emitter Passivation Effects in the Record High Efficiency N-Type Dendritic Web
Silicon Solar Cell,” Proceedings of the 26th IEEE Photovoltaic Specialists
Conference, pp. 235-238, Anaheim, California, September 29 – October 4, 1997. - T. Krygowski and A. Rohatgi, “Simultaneous P and B Diffusion, In-Situ Surface
Passivation, Impurity Filtering and Gettering for High-Efficiency Silicon Solar
Cells,” Proceedings of the 26th IEEE Photovoltaic Specialists Conference, pp. 19-24,
Anaheim, California, September 29 – October 4, 1997. - S. Narasimha and A. Rohatgi, “Optimized Aluminum Back Surface Field Techniques for
Silicon Solar Cells,” Proceedings of the 26th IEEE Photovoltaic Specialists
Conference, pp-63-66, Anaheim, California, September 29 – October 4, 1997. - P. Doshi, J. Moschner, J. Jeong, A. Rohatgi, R. Singh and S. Narayanan,
“Characterization and Application of Rapid Thermal Oxide Surface Passivation for the
Highest Efficiency RTP Silicon Solar Cells,” Proceedings of the 26th IEEE
Photovoltaic Specialists Conference, pp. 87-90, Anaheim, California, September 29 –
October 4, 1997. - M. E. Ropp, M. Begovic and A. Rohatgi, “Determination of the Curvature Mismatch
Factor for the Georgi Tech Aquatic Center Photovoltaic Array,” Proceedings of the
26th IEEE Photovoltaic Specialists Conference, pp. 1297-1300, Anaheim, California,
September 29 – October 4, 1997. - J. Moschner, P. Doshi, D. S. Ruby, T. Lauinger, A. G. Aberle and A. Rohatgi,
“Comparison of Front and Back Surface Passivation Schemes for Silicon Solar
Cells,” Proceedings of the 2nd World Conference and Exhibition on Photovoltaic
Solar Energy Conversion, Hofburg Kongresszentrum, Wien, Austria, July 6-10, 1998. - M. Begovic, M. Ropp, and A. Rohatgi, “Determining the Likelihood of Islanding of
Photovoltaic Systems by Modeling and Statistical Analysis,” Proceedings of the 2nd
World Conference and Exhibition on Photovoltaic Solar Energy Conversion, Hofburg
Kongresszentrum, Wien, Austria, July 6-10, 1998. - D. Meier, H. P. Davis, P. D. Meier, A. Shibata, B. J. Meier, T. Abe, K. Kinoshita, C.
Bishop, S. Mahajan, A. Rohatgi, P. Doshi, and M. Finnegan, “Self-Doping Contacts and
Associated Silicon Solar Cell Structures,” Proceedings of the 2nd World Conference
and Exhibition on Photovoltaic Solar Energy Conversion, Hofburg Kongresszentrum, Wien,
Austria, July 6-10, 1998. - A. Rohatgi and S. Narasimha, “Effective Passivationof the Low Resistivity Silicon
Surface by a Rapid Thermal Oxide/PECVD Silicon Nitride Stack for Gridded Back Contact
Solar Cells,” Proceedings of the 2nd World Conference and Exhibition on
Photovoltaic Solar Energy Conversion, Hofburg Kongresszentrum, Wien, Austria, July
6-10, 1998. - W.A. Doolittle, A. Rohatgi, R. Ahrenkiel, D. Levi, G. Augustine and R. H. Hopkins,
“Understanding the Role of Defects in Limiting the Minority Carrier Lifetime in
SiC,” Proceedings of the Fall Material Research Conference, Boston, MA,
December 1-5, 1997. - K. Li, Z. C. Feng, A. T. S. Wee, H. C. Chou, J. Y. Lin, S. Kamra, K. L. Tan, A. Rohatgi,
L. Zhou and S. F. Y. Li, “Several Efficiency Influencing Factors in CdTe/CdS Solar
Cells,” Proceedings of the Fall Material Research Conference, Boston, MA, December
1-5, 1997.
- A. Rohatgi and R. Sudharsanan, “MOCVD of Compound Semiconductors for
-
Papers in Conference
Proceedings (non-refereed)- A. Rohatgi, “High Efficiency Polycrystalline Silicon Solar Cells”, Proceedings
of the 4th Sunshine Workshop on Crystalline Silicon Solar Cells, pp. 67-75, Chiba, Japan,
November 1992. - A. Rohatgi, P. Sana, Z. Chen, J. Salami, and G.Crotty, “Silicon Photovoltaic
Research at Georgia Tech,” to be published in Proceedings of the Sixth Sunshine
Workshop on Crystalline Silicon Solar Cells, pp. 35-54, Tokyo, Japan, November 1993. - Z.C. Feng, A. Rohatgi, A.T.S. Wee, Z.C. Feng, H.C. Chou, S. Kamra and A. Rohatgi,
“Optical and Surface Analysis of Bulk 6H-SiC Single Crystalline Wafers,” Bull
Am. Physics. Soc. Vol. 40, No. 1, pp.219, 1995. - S.Narasimha, J. Mejia, and A. Rohatgi, “Screen Printed Aluminum Back Surface Fields
for Silicon Solar Cells,” Sixth Workshop on the Role of Impurities and Defects in
Silicon Device Processing, Snow Mass, Colorado, August 12-14, 1996 - T.Krygowski, and A. Rohatgi, “A Simultaneous Front and Back Diffusion Technique for
the Low Cost Production of High Efficiency Silicon Solar Cells,” Sixth Workshop on
the Role of Impurities and Defects in Silicon Device Processing, Snow Mass, Colorado,
August 12-14, 1996. - A.Rohatgi and S. Narasimha, “High-Efficiency Cell Fabrication on Low-Defect Density
Materials,” - Sixth Workshop on the Role of Impurities and Defects in Silicon Device Processing, Snow
Mass, Colorado, August 12-14, 1996. - A. Rohatgi, S. Narasimha and L. Cai, “Gettering and Passivation of High Efficiency
Multicrystalline Silicon Solar Cells,” accepted for publication American Institute of
Physics Conference Proceedings, November,1996.
- A. Rohatgi, “High Efficiency Polycrystalline Silicon Solar Cells”, Proceedings
-
Patents and Patent
Disclosure Awards1979 / 1980 / 1981 / 1982 / 1983 / 1984 / 1985 / 1986 / 1987 / 1991 / 1992 / 1994 / 1995 / 1996 / 1998
- A. Rohatgi and R.B. Campbell, “Contact System for Semiconductor
Devices”, RES 79-118; R&D Disclosure Award plus NASA Certificate of
Recognition, 1979.
1979 / 1980 / 1981 / 1982 / 1983 / 1984 / 1985 / 1986 / 1987 / 1991 / 1992 / 1994 / 1995 / 1996 / 1998
- A. Rohatgi, J. Bartko and J.R. Davis, “Techniques for Radiation Hardening
Devices Sensitive to Displacement Damage”, RES 80-298; Disclosure Award,
1980. - J. Bartko, R.C. Smith, and A. Rohatgi, “The Fabrication of Optimized Solar
Cells”, RES 80-386; Disclosure Award, 1980.
1979 / 1980 / 1981 / 1982 / 1983 / 1984 / 1985 / 1986 / 1987 / 1991 / 1992 / 1994 / 1995 / 1996 / 1998
- R.G. Seidensticker, P. Rai-Choudhury, R.H. Hopkins and A. Rohatgi, “A
Method for Growing High Purity Silicon Dendritic Web for Solar Cell Applications”,
RES 81-110; Disclosure Award, Westinghouse Trade Secret Acknowledgement Certificate, 1981.
1979 / 1980 / 1981 / 1982 / 1983 / 1984 / 1985 / 1986 / 1987 / 1991 / 1992 / 1994 / 1995 / 1996 / 1998
- A. Rohatgi, “Annealing Process Induced Radiation Damage”, RES
82-346, Disclosure Award, 1982.
1979 / 1980 / 1981 / 1982 / 1983 / 1984 / 1985 / 1986 / 1987 / 1991 / 1992 / 1994 / 1995 / 1996 / 1998
- M.R. Chin and A. Rohatgi, “Low Temperature Growing of Oxinitride”,
RES 83-068; Disclosure Award, 1983. - A. Rohatgi, S. Dutta, P. Rai-Choudhury, and R.G. Seidensticker, “Twin Plane
Assisted Internal Gettering in Dendritic Web Silicon”, RES 83-124, 1983.
1979 / 1980 / 1981 / 1982 / 1983 / 1984 / 1985 / 1986 / 1987 / 1991 / 1992 / 1994 / 1995 / 1996 / 1998
- A. Rohatgi, P. Rai-Choudhury, and D.W. Whitson, “Chlorine Implantation to
Improve Break-down Voltage, Radiation Hardness and Thermal Stability of MOS Devices”,
RES 84-330, 1984.
1979 / 1980 / 1981 / 1982 / 1983 / 1984 / 1985 / 1986 / 1987 / 1991 / 1992 / 1994 / 1995 / 1996 / 1998
- A. Rohatgi, R.A. Hoffman, T.W. O’Keefe, R.B. Campbell, and P. Rai-Choudhury, “Development
of ZnSe + MgF2 + Double Layer AR Coating and Aluminum Back Surface Reflection
for High Efficiency Dendritic Web Silicon Solar Cells”, RES 85-124, 1985. - A. Rohatgi, P. Rai-Choudhury, J.R. Gigante, R. Singh, and S.J. Fonash, “Use
of Hydrogen Ion Beam for Low Temperature Processing of Low Leakage, Shallow Junction Ion
Implanted Devices”, U.S. Patent 4,522,657, 1985.
1979 / 1980 / 1981 / 1982 / 1983 / 1984 / 1985 / 1986 / 1987 / 1991 / 1992 / 1994 / 1995 / 1996 / 1998
- A. Rohatgi, R.B. Campbell and P. Rai-Choudhury, “High Efficiency Solar Cell
Designs Using Doped Polysilicon Layers – A Novel Approach”, Disclosure Award
plus NASA Recognition Certificate, 1986.
1979 / 1980 / 1981 / 1982 / 1983 / 1984 / 1985 / 1986 / 1987 / 1991 / 1992 / 1994 / 1995 / 1996 / 1998
- A. Rohatgi, “Development of Coatings for Efficient Solar Cells”,
NASA Patent Disclosure Award and Recognition Certificate, 1987.
1979 / 1980 / 1981 / 1982 / 1983 / 1984 / 1985 / 1986 / 1987 / 1991 / 1992 / 1994 / 1995 / 1996 / 1998
- A.W. Smith and A. Rohatgi, “Texture: A Ray Tracing Program for Textured
Surfaces”, a code for assessing light trapping in textured semiconductors,
Georgia Tech Research Corporation, copyright 1991.
1979 / 1980 / 1981 / 1982 / 1983 / 1984 / 1985 / 1986 / 1987 / 1991 / 1992 / 1994 / 1995 / 1996 / 1998
- R.K. Feeney, D.R. Hertling, and A. Rohatgi, “A High Resolution
Non-Destructive Apparatus for the Measurement of Transient Electrical Conductivity”,
U.S. Patent #07/985,635, 1992.
1979 / 1980 / 1981 / 1982 / 1983 / 1984 / 1985 / 1986 / 1987 / 1991 / 1992 / 1994 / 1995 / 1996 / 1998
- A. Rohatgi, H. Mehta and N.G. Hingorani, “Grid Contact Self Inversion Layer
Cells,” U.S. Patent application filed, 1994. - A. Rohatgi, H. Mehta and N.G. Hingorani, “Grid Contact Self Inversion Layer
Cells,” U.S. Patent application filed, 1994.
1979 / 1980 / 1981 / 1982 / 1983 / 1984 / 1985 / 1986 / 1987 / 1991 / 1992 / 1994 / 1995 / 1996 / 1998
- Z.Chen, A.Rohatgi, “Method for Low Temperature Plasma Enhanced Chemical
Vapor Deposition (PECVD) of an Oxide and Nitride Antireflection Coating on Silicon”,
U.S. Patent #5,418,019, 1995. - Z. Chen, A. Rohatgi, “Method for passivating Silicon Devices at Low
Temperature to Achieve Low Interface State Density and Low Recombination Velocity While
Preserving Carrier Lifetime,” U.S. Patent #5,462,898, 1995. - W.J. Lackey,A. Rohatgi, A. Smith, B.N. Beckloff, S. Narashima, “Low Cost,
Thin Film Solar Cells Prepared by Chemical Vapor Deposition of Titanium Diboride and
Silicon”, Disclosure Award, 1995. - Z.Chen, A.Rohatgi, “Method for Low Temperature Plasma Enhanced Chemical
Vapor Deposition (PECVD) of an Oxide and Nitride Antireflection Coating on Silicon”,
U.S. Patent #5,418,019, 1995. - Z. Chen, A. Rohatgi, “Method for passivating Silicon Devices at Low
Temperature to Achieve Low Interface State Density and Low Recombination Velocity While
Preserving Carrier Lifetime,” U.S. Patent #5,462,898, 1995. - W.J. Lackey,A. Rohatgi, A. Smith, B.N. Beckloff, S. Narashima, “Low Cost,
Thin Film Solar Cells Prepared by Chemical Vapor Deposition of Titanium Diboride and
Silicon”, Disclosure Award, 1995.
1979 / 1980 / 1981 / 1982 / 1983 / 1984 / 1985 / 1986 / 1987 / 1991 / 1992 / 1994 / 1995 / 1996 / 1998
- R.K. Feeney, D.R. Hertling, and A. Rohatgi, “Time Varying Electrical
Conductivity Tester Using Frequency Discrimination and Power Detector and Methods,”
U.S. Patent #5495170, February 1996. - A. Rohatgi, Z. Chen, P. Doshi, K.Tate, J.Mejia, “Processes for Producing
Low Cost High Efficiency Silicon Solar Cells,” U.S. Patent 5,520,271, April
1996. - R.K. Feeney, A. Rohatgi and D.R. Hertling, “Electrical conductivity Tester
and Methods Thereof For Accurately Measuring Time-Varying And Steady State Conductivity
Using Phase Shift Detection,” U.S. Patent #5,508, 610, April 1996. - W.A. Doolittle and A. Rohatgi, “A Novel Computer Based Pseudo-Logarithmic
Capacitance/Conductance DLTS System – ROI #1249 “DLTS”, U.S. Patent
5,521,839, 1996. - R.K. Feeney, D.R. Hertling, and A. Rohatgi, “Time Varying Electrical
Conductivity Tester Using Frequency Discrimination and Power Detector and Methods,”
U.S. Patent #5495170, February 1996. - A. Rohatgi, Z. Chen, P. Doshi, K.Tate, J.Mejia, “Processes for Producing
Low Cost High Efficiency Silicon Solar Cells,” U.S. Patent 5,510,271, April
1996.
- R.K. Feeney, A. Rohatgi and D.R. Hertling, “Electrical conductivity Tester
and Methods Thereof For Accurately Measuring Time-Varying And Steady State Conductivity
Using Phase Shift Detection,” U.S. Patent #5,508, 610, April 1996.
1979 / 1980 / 1981 / 1982 / 1983 / 1984 / 1985 / 1986 / 1987 / 1991 / 1992 / 1994 / 1995 / 1996 / 1998
- A. Rohatgi, Z. Chen, P. Doshi, “Processes for Producing Low Cost High
Efficiency Silicon Solar Cells”, U.S. Patent #5,766,964, June, 1998. - A. Rohatgi, T. Krygowski, “Arrangement, Dopant Source and Method for Making
Photovoltaic Cells”, U.S. Patent #5,972,784