Photovoltaic Cells for Very High Altitude Very Long Endurance Solar Aircraft

Award Information
Agency:
Department of Defense
Branch
Defense Advanced Research Projects Agency
Amount:
$750,000.00
Award Year:
2009
Program:
SBIR
Phase:
Phase II
Contract:
W31P4Q-09-C-0228
Award Id:
81318
Agency Tracking Number:
07SB2-0613
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
PO Box 416, Windham, NH, 03087
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
800129160
Principal Investigator:
ArthurPitera
Senior Research Scientist
(617) 549-4623
apitera@4powerllc.com
Business Contact:
EugeneFitzgerald
Member, Co-Founder
(603) 275-0861
eafitz@4powerllc.com
Research Institute:
n/a
Abstract
This proposed Phase II program will deliver a lightweight triple-junction solar cell that eliminates the current-matching bottleneck of current state-of-the-art InGaP/GaAs/Ge cells on Ge. This will be achieved by constructing a triple junction structure on the lattice constant of SiGe, allowing the integration of semiconductors with bandgaps that are optimized for the best possible triple-junction efficiency. The cell design proposed for Phase II has a practical achievable efficiency of 47% (AM1.5 spectrum without concentration), far exceeding the current record of 32% for the same illumination conditions. III-V cell development on the SiGe lattice constant is a natural direction for 4Power's substrate platform which already utilizes SiGe graded buffers. This strategy for optimized solar cell efficiency is fully compatible with our Si-encapsulated cell technology demonstrated in Phase I. The multijunction cell that will be developed in Phase II will incorporate both Si encapsulation and uniquely accessible optimum bandgap profiles such that high volume/low cost production of ultra-high specific power cells in a Si-compatible manufacturing environment is enabled.

* information listed above is at the time of submission.

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