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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171 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

Bibliographical note

KAUST Repository Item: Exported on 2021-01-13
Acknowledged KAUST grant number(s): OSR-CRG2018-3737
Acknowledgements: This work was supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under award no. OSR-2018-CPF-3669.02, KAUST OSR-CARF URF/1/ 3079-33-01, KAUST OSR-CRG RF/1/3383, KAUST OSR-CRG2018-3737 and IED OSR-2019-4208. This work was supported in part by the US Department of the Navy, Office of Naval Research (grant award no. N00014-20-1-2572). The financial support of the German Federal Ministry for Economic Affairs and Energy (CAPITANO, funding code 03EE1038B) and the Initiating and Networking funding of the Helmholtz Association (HYIG to U.W.P. (funding code VH-NG1148), PEROSEED (funding code ZT-0024) and the Science and Technology of Nanostructures Research Program) is acknowledged. Furthermore, we are grateful for the help and support of A. Mertens and A. Rozalier from KIT in setting up the outdoor measurements in Karslruhe as well as M. Langenhorst, R. Schamger and J. Lehr for developing earlier versions of the energy-yield software. We acknowledge the support of ABET Technologies and Newport. We thank TUV Rheinland Group, Germany, for providing solar spectra from TUV’s outdoor test field on the KAUST campus, Thuwal, Saudi Arabia. We are grateful for the support of J. L. Mynar and the KAUST Corelab, and for the fruitful discussions with A. H. Balawi.


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