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

Dong Xu; Biegala, Tom; Carmody, Michael; Garland, James W.; Grein, Christoph; Sivananthan, Sivalingam
February 2010
Applied Physics Letters;2/15/2010, Vol. 96 Issue 7, p073508
Academic Journal
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.


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