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Re: heavy hitter and hiring...

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Re: heavy hitter and hiring...

onehourphotonic

posted on Jan 12, 2016 03:47PM

EpiWorks, Inc.

High-Efficiency, High-Temperature, Ultra-Lightweight GaP-Based Solar Cells

National Aeronautics and Space Administration

Phase I

SBIR

67030

NNC07QA24P

January 19, 2007

July 23, 2007

2006

S2.03

2007

98048

44534407

www.epiworks.com

1606 Rion Drive

Champaign

61822-9598

David H Ahmari

Business Official

(217) 373-1590

dahmari@epiworks.com

David J Ahmari

Principal Investigator

(217) 373-1590

dahmari@epiworks.com

Optical & Photonic Materials; Semi-Conductors/Solid State Device Materials; Photovoltaic Conversion; Renewable Energy

The objective of this proposal is to study and demonstrate novel GaAsNP/GaP/AlGaP technology for use in extreme photovoltaic (PV) energy conversion. NASA and the scientific community are interested in solar missions that go as far as Saturn or even into near sun conditions. Such missions present a challenging problem for PV technology. In addition to the requisite high efficiency and reduced solar cell payload mass, these missions require a PV technology that can withstand the increased solar intensity, radiation and temperature.

We propose studying two possible solar cell designs: The first design utilizes novel, wide gap GaP-based materials to provide bandgaps well suited for high-temperature operation and to enhance function in high radiation and near sun missions. Such an approach will enable solar cells to operate at and above 450 Celcius with the highest possible efficiency. As part of this study we would investigate the deposition of AlGaP on GaP to provide materials with bandgaps at or above 2.4 eV. The second design we will investigate uses more standard materials that EpiWorks has already developed for different applications. This design would employ InAlP (2.4eV bandgap) lattice-matched to GaAs as the key wide gap material. We will study the expected temperature dependence and other key thermal properties of such a design and compare to the GaP-based approach.

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