High Efficiency, High Mass Specific Power Two-Terminal Solar Cells

Award Information
Agency:
National Aeronautics and Space Administration
Amount:
$99,997.00
Program:
SBIR
Contract:
NNX08CB48P
Solitcitation Year:
2007
Solicitation Number:
N/A
Branch:
N/A
Award Year:
2008
Phase:
Phase I
Agency Tracking Number:
074707
Solicitation Topic Code:
S3.03
Small Business Information
EPIR Technologies, Inc.
590 Territorial Drive, Suite B, Bolingbrook, IL, 60440-4634
Hubzone Owned:
N
Woman Owned:
N
Socially and Economically Disadvantaged:
N
Duns:
068568588
Principal Investigator
 Paul Boieriu
 Principal Investigator
 (630) 771-0203
 pboieriu@epir.com
Business Contact
 Sivalingam Sivananthan
Title: President
Phone: (630) 771-0201
Email: ssivananthan@epir.com
Research Institution
N/A
Abstract
Future NASA missions will require significant improvements in photovoltaic energy conversion efficiency (>30%) and mass specific power (>600 W/kg), and improved radiation tolerance. We propose to develop a high efficiency monolithic three-junction, two-terminal solar cell using lattice matched HgCdZnTe and/or HgCdMgTe alloys, which will offer great advantages in terms of weight and interconnect simplicity as well as improvements in efficiency. The use of frequency down conversion by divalent Sm/Eu and trivalent Yb/Tb halides embedded in the protective coatings of the solar cells to increase the efficiency of photovoltaic conversion will be investigated. The predicted ideal efficiencies are greater than 50%. During Phase I we will determine the optimal layer thicknesses, doping profiles and current density matching requirements for two-terminal multiple-heterojunction solar cell designs. We will grow HgCdZnTe layers with Zn composition ≈ 0.5 on a Si substrate using a thin CdTe/ZnTe strained-layer superlattice to eliminate cracking and minimize strain, will optimize the growth of HgCdMgTe, and will measure mobilities and minority carrier lifetimes in the layers. We will fabricate and test a two-junction solar cell. Frequency down conversion will be demonstrated, progress toward its optimization will be made, and optical fusion of the solar cell and protective layers will be investigated.

* information listed above is at the time of submission.

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