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Proposed monolithic triple-junction solar cell structures with the potential for ultrahigh efficiencies using II–VI alloys and silicon substrates

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6 Author(s)
Xu, Dong ; EPIR Technologies, Inc., 590 Territorial Drive, Unit B, Bolingbrook, Illinois 60440, USA ; Biegala, T. ; Carmody, Michael ; Garland, James W.
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The efficiencies of monolithic single-crystal II–VI and III–V, two-junction and three-junction solar cells are calculated. The structures consist of II–VI or III–V homojunctions grown on an active-junction substrate (silicon for II–VI and germanium for III–V) and of inverted three-junction II–VI or III–V structures, with the band gaps chosen to maximize the efficiencies. Our calculations for the II–VI cells give theoretical efficiencies up to 44% under 1 sun and 50% under 500 suns, ∼3% absolute higher than for the III–V cells. Maximum obtainable laboratory and production-line efficiencies for multijunction II–VI cells are predicted. Preliminary laboratory results for II–VI two-junction cells are also presented.

Published in:

Applied Physics Letters  (Volume:96 ,  Issue: 7 )

Date of Publication:

Feb 2010

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