Efficient bifacial monolithic perovskite/silicon tandem solar cells via bandgap engineering

Michele de Bastiani, Alessandro J. Mirabelli, Yi Hou, Fabrizio Gota, Erkan Aydin, Thomas Allen, Joel Troughton, Anand Selvin Subbiah, Furkan Halis Isikgor, Jiang Liu, Lujia Xu, Bin Chen, Emmanuel Van Kerschaver, Derya Baran, Beatrice Fraboni, Michael F. Salvador, Ulrich W. Paetzold, E. Sargent, Stefaan De Wolf

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157 Scopus citations


Bifacial monolithic perovskite/silicon tandem solar cells exploit albedo—the diffuse reflected light from the environment—to increase their performance above that of monofacial perovskite/silicon tandems. Here we report bifacial tandems with certified power conversion efficiencies >25% under monofacial AM1.5G 1 sun illumination that reach power-generation densities as high as ~26 mW cm–2 under outdoor testing. We investigated the perovskite bandgap required to attain optimized current matching under a variety of realistic illumination and albedo conditions. We then compared the properties of these bifacial tandems exposed to different albedos and provide energy yield calculations for two locations with different environmental conditions. Finally, we present a comparison of outdoor test fields of monofacial and bifacial perovskite/silicon tandems to demonstrate the added value of tandem bifaciality for locations with albedos of practical relevance.
Original languageEnglish (US)
JournalNature Energy
StatePublished - Jan 11 2021


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