Radiation-Hard, High Efficiency InP/InN Tandem Cells

Award Information
Agency:
Department of Defense
Branch
Missile Defense Agency
Amount:
$99,931.00
Award Year:
2004
Program:
STTR
Phase:
Phase I
Contract:
HQ0006-04-C-7104
Award Id:
69783
Agency Tracking Number:
B045-017-0097
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
One Patriots Park, Bedford, MA, 01730
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
065137978
Principal Investigator:
Steven Wojtczuk
Senior Scientist
(603) 595-8900
swojtczuk@bandwidthsemi.com
Business Contact:
Mark Little
CEO, Spire Biomedical, Inc.
(781) 275-6000
mlittle@spirecorp.com
Research Institute:
Lawrence Berkeley Laboratory
Joel Ager
One Cyclotron Road
Berkeley, CA, 94720
(510) 486-6715
Nonprofit college or university
Abstract
Spire proposes to investigate InP/InN tandem solar cells for applications where extreme radiation-hardness is needed. Indium phosphide (InP) has proven itself as a radiation-hard cell material, and indium nitride (InN) has shown superior radiation resistance to 2MeV protons. InP (1.34 eV) and InN (0.7eV) bandgaps allow current-matching (38 mA/cm2) under the AM0 spectrum, enabling two-terminal operation. We will investigate use of a pseudomorphic InGaP window to boost InP top cell efficiency from its current 19% one-sun AM0 level to 22%. We describe a process that allows the InP top cell to be undisturbed by dislocations from the InN growth. The 0.7eV InN bottom cell has an upper efficiency limit of ~9% AM0; however, the growth of InN would introduce substantial dislocations, and its efficiency would likely be about 4%. However, the dislocations should not compromise the InN radiation hardness, and we believe that the proposed research should lead to tandem space cells with efficiencies of ~26% (1 sun AM0, 25C) which would be flat in power output to fluences beyond 1e16 1MeV electrons/cm2.

* information listed above is at the time of submission.

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