NASA SBIR 2003 Solicitation

FORM B - PROPOSAL SUMMARY


PROPOSAL NUMBER:03-E2.07-8668 (For NASA Use Only - Chron: 034337)
SUBTOPIC TITLE:Energy Conversion for Space Applications
PROPOSAL TITLE:High Efficiency Solar Cell on Low Cost Metal Foil Substrate

SMALL BUSINESS CONCERN (Firm Name, Mail Address, City/State/Zip, Phone)
Brimrose Corporation of America
5024 Campbell Blvd., Suite E
Baltimore ,MD 21236 - 4968
(410) 931 - 7200

PRINCIPAL INVESTIGATOR/PROJECT MANAGER (Name, E-mail, Mail Address, City/State/Zip, Phone)
Gomath V. Jagannathan
gnathan@brimrose.com
5024 Campbell Boulevard, Suite E
Baltimore ,MD  21236 -4968
(410) 668 - 5800
U.S. Citizen or Legal Resident: Yes

TECHNICAL ABSTRACT (LIMIT 200 WORDS)
Future space missions will require Solar cell arrays having specific power ratings in excess of 1000 W/kg. Conventional crystalline photovoltaic technology comprised of epitaxial photovoltaic semiconductor materials grown on single crystal semiconductor substrates, cannot provide these specific ratings. We propose to synthesize nano-precursors of solar cell materials of uniform size by Solvo-thermal process. These nano-precursors will be deposited as nano-thin film on low cot and flexible metal foil substrate by Electrophoretic technique. Through subsequent , insitu annealing, thin films with grain size >50 microns will be produced. GaAs, Ge and InP will be investigated to determine which material can be deposited as high quality large grain thin film without contamination. The synthesized nano-precursors, electrphoretically deposited nano-thin film and large grain thin film produced after annealing will be fully characterized. A combination of crystalline thin film photovoltaic layers having an efficiency of just 25% fabricated on low cost, light weight flexible substrate such as a metal foil, would yield a specific power rating of >1200 W/kg. During Phase II multi-junction solar cell will be grown on the large grain thin film produced during Phase I on flexible/low cost metal foil substrate.

POTENTIAL NASA COMMERCIAL APPLICATIONS (LIMIT 150 WORDS)
The success of this research will result in the availability of very high efficiency/specific power solar cell, produced at economically attractive cost with high BOL and EO on low cost/flexible metal substrate. NASA applications are in generating power in space based satellite, Inter National Space station, Hubble telescope and other space systems which require efficient solar power generation.

POTENTIAL NON-NASA COMMERCIAL APPLICATIONS (LIMIT 150 WORDS)
The major spin off is the use of this solar cell system for production of high efficiency concentrator terrestrial solar energy conversion system at attractive cost.