S. Essig, C. Allébe, J. Geisz, M. Steiner, B. Paviet‐Salomon, A. Descoeudres, A. Tamboli, L. Barraud, S. Ward, N. Badel, V. LaSalvia, J. Levrat, M. Despeisse, C. Ballif, P. Stradins, D. Young
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Boosting the efficiency of III-V/Si tandem solar cells
We have developed Si-based tandem solar cells with a certified 1-sun efficiency of 29.8% (AM1.5g). The four-terminal tandem devices consist of 1.8 eV rear-heterojunction GaInP top cells and silicon heterojunction bottom cells. The two subcells were fabricated independently in two different labs and merged using an optically transparent, electrically insulating epoxy. Work is ongoing to further improve the performance of each subcell and to push the tandem cell efficiency to > 30%.
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