Thermophotovoltaic Arrays for Electrical Power Generation Page: 2 of 9
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Therrnophotovoltaic Arrays
for
Electrical Pover Generation
Sarnc Corpra ion
Sarnoff has designed an integrated array of thermophotovultaic (TPV) eells based on the
ln(Ai )GaAsSb/GaSb materials system. These arrays will be used in a system to generate
electrical power from a radioisotope heat source that radiates at temperatures froi 700 to
1000 C. Two arrays sandwich the slab heat source and will be connected in sees to
build voltage. Between the arrays and the heat source is a spectra control filter that
transmits abovetbandgap radiation and reflects below-bandgap radiation, The goal is to
generate 5 trW of electrical power at 3 V from a 700 C radiant source.
Sarnoff is a leader in antimonide-based TPV cell evelopnient [1, 2], InGaAsSb cells
with a handga p of 0,53 eV have operated at system conversion efficiencies greater than
17 % [3, 4]. The system included a front-surface filter, and a 950-"C radiation source.
The cells were grown via rgano-metalli vapor-phase epitaxy. Sar off will bring this
experience to bear on the proposed project,
We first describe array and cell architecture, We then present calculated results showing
that about 80 mW of power can be obtained from a 700-*T radiator, Using a conservative
array design, a 5-V output is possible.
Cell and Array Architecture
Figure I shows a schematic cross-section of a 6-element array.
ntGaSb Substrate
L....Figure 1, (A) Schematic cross-secfion of a 6-element Tr V cell array
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Corporation, Sarnoff. Thermophotovoltaic Arrays for Electrical Power Generation, report, November 18, 2003; Schenectady, New York. (https://digital.library.unt.edu/ark:/67531/metadc780887/m1/2/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.