NASA STTR 2011 Solicitation


PROPOSAL NUMBER: 11-1 T3.01-9817
RESEARCH SUBTOPIC TITLE: Technologies for Space Power and Propulsion
PROPOSAL TITLE: Advanced Epitaxial Lift-Off Quantum Dot Photovoltaic Devices

NAME: MicroLink Devices NAME: Rochester Institute of Technology
STREET: 6457 Howard Street STREET: 141 Lomb Memorial Drive
CITY: Niles CITY: Rochester
STATE/ZIP: IL  60714 - 3301 STATE/ZIP: NY  14623 - 5608
PHONE: (847) 588-3001 PHONE: (585) 475-2977

PRINCIPAL INVESTIGATOR/PROJECT MANAGER (Name, E-mail, Mail Address, City/State/Zip, Phone)
Rao Tatavarti
6457 West Howard St
Niles, IL 60714 - 3301
(847) 588-3001 Extension :17

Estimated Technology Readiness Level (TRL) at beginning and end of contract:
Begin: 2
End: 4

TECHNICAL ABSTRACT (Limit 2000 characters, approximately 200 words)
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.

POTENTIAL NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
When fully developed, the quantum dot solar cells will be suitable for use in the following NASA applications: replacement for conventional triple junction cells on spacecraft, solar panels for next generation solar electric propulsion (SEP) spacecraft, and solar-powered high altitude, long endurance (HALE) aircraft.

POTENTIAL NON-NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
The lightweight, high efficiency solar cells to be developed in this program can be used in the following non-NASA applications: replacement for conventional triple junction cells on spacecraft, solar-powered high altitude, long endurance (HALE) aircraft, solar blankets for terrestrial power generation, and terrestrial solar concentrators.

TECHNOLOGY TAXONOMY MAPPING (NASA's technology taxonomy has been developed by the SBIR-STTR program to disseminate awareness of proposed and awarded R/R&D in the agency. It is a listing of over 100 technologies, sorted into broad categories, of interest to NASA.)
Manufacturing Methods
Materials & Structures (including Optoelectronics)
Materials (Insulator, Semiconductor, Substrate)
Microfabrication (and smaller; see also Electronics; Mechanical Systems; Photonics)
Sources (Renewable, Nonrenewable)

Form Generated on 11-22-11 13:44