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Proceedings Paper

High-Efficiency Crystalline Tandem Cells
Author(s): John C. C. Fan; B- Y. Tsaur; B. J. Palm
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Paper Abstract

Computer analysis of crystalline solar cells indicates that a substantial increase in cell conversion efficiencies can be achieved by using two-cell, multi-bandgap tandem structures instead of single-junction cells. Practical AM1 efficiencies of about 30% at one sun and over 30% at multiple suns are to be expected. The further increases in efficiency calculated for a three-cell tandem structure are smaller and may not justify the added complexity. For inexpensive two-cell tandem modules, Si is preferred for the bottom cell, and the top cell material should have a bandgap of 1.75 to 1.80 eV. The GaAs-AlAs and GaAs-GaP systems are attractive candidates for the top cell. Significant advances have been achieved in growing GaAs on Ge-coated Si substrates (for the two-terminal, two-cell structure) and in growing free-standing ultrathin GaAs layers (for the two-terminal or four-terminal structures). These material advances should be transferable to the GaAs-AlAs and GaAs-GaP systems.

Paper Details

Date Published: 8 September 1983
PDF: 15 pages
Proc. SPIE 0407, Photovoltaics for Solar Energy Applications II, (8 September 1983); doi: 10.1117/12.935690
Show Author Affiliations
John C. C. Fan, Massachusetts Institute of Technology (United States)
B- Y. Tsaur, Massachusetts Institute of Technology (United States)
B. J. Palm, Massachusetts Institute of Technology (United States)


Published in SPIE Proceedings Vol. 0407:
Photovoltaics for Solar Energy Applications II
David Adler, Editor(s)

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