Advanced Epitaxial Lift-Off Quantum Dot Photovoltaic Devices

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX12CG11P
Agency Tracking Number: 110183
Amount: $125,000.00
Phase: Phase I
Program: STTR
Awards Year: 2012
Solicitation Year: 2011
Solicitation Topic Code: T3.01
Solicitation Number: N/A
Small Business Information
MicroLink Devices
6457 Howard Street, Niles, IL, -
DUNS: 135553472
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Rao Tatavarti
 Principal Investigator
 (847) 588-3001
 rtatavarti@mldevices.com
Business Contact
 Noren Pan
Title: Business Official
Phone: (847) 588-3001
Email: npan@mldevices.com
Research Institution
 Rochester Institute of Technology
 David Harrison
 141 Lomb Memorial Drive
Rochester, NY, 14623-5608
 () -
 Domestic nonprofit research organization
Abstract
We propose to develop a high-efficiency, triple-junction, epitaxial lift-off (ELO) solar cell by incorporating quantum dots (QDs) within the current-limiting subcell. We intend to leverage existing QD epitaxy processes developed by the Rochester Institute of Technology and combine this with MicroLink's expertise in multi-junction cell growth and ELO technology. We will employ QDs to enhance the middle cell absorption in a InGaP/GaAs/InGaAs metamorphic IMM cell. Detailed balance calculations indicate that the triple junction efficiency can be increased to ~42% by reducing the bandgap of the middle cell to ~1.2 eV. The combination of the QD technology with multi-junction ELO technology will be exploited in two ways: i) ELO GaAs cells with QD can be grown into full triple-junction cells and ii) back-surface reflectors on the ELO cells will be used to improve absorption by routing IR light for a second pass through the QD subcell. The relevance of this work to NASA is that it will result in lightweight, high-efficiency, triple-junction solar cells that will have a specific power>500 W/kg. In addition, the use of QDs has been shown to improve radiation tolerance of the photovoltaic device.

* information listed above is at the time of submission.

Agency Micro-sites

SBA logo
Department of Agriculture logo
Department of Commerce logo
Department of Defense logo
Department of Education logo
Department of Energy logo
Department of Health and Human Services logo
Department of Homeland Security logo
Department of Transportation logo
Environmental Protection Agency logo
National Aeronautics and Space Administration logo
National Science Foundation logo
US Flag An Official Website of the United States Government