Perovskite/silicon tandem solar cells promise power conversion efficiencies beyond the Shockley–Queisser limit of single-junction devices; however, their actual outdoor performance is yet to be investigated. Here we fabricate 25% efficient two-terminal monolithic perovskite/silicon tandem solar cells and test them outdoors in a hot and sunny climate. We find that the temperature dependence of both the silicon and perovskite bandgaps—which follow opposing trends—shifts the devices away from current matching for two-terminal tandems that are optimized at standard test conditions. Consequently, we argue that the optimal perovskite bandgap energy at standard test conditions is <1.68 eV for field performance at operational temperatures greater than 55 °C, which is lower compared with earlier findings. This implies that bromide-lean perovskites with narrower bandgaps at standard test conditions—and therefore better phase stability—hold great promise for the commercialization of perovskite/silicon tandem solar cells.
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The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST) under award nos. OSR-CARF URF/1/3079-33-01 and IED OSR-2019-4208. The authors thank TUV Rheinland Group for providing solar spectra from their outdoor test field on the KAUST campus. J.Á. thanks the Spanish Ministry of Education, Culture and Sport for his pre-doctoral grant (FPU14/04466).
The authors declare no competing interests.
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Aydin, E., Allen, T.G., De Bastiani, M. et al. Interplay between temperature and bandgap energies on the outdoor performance of perovskite/silicon tandem solar cells. Nat Energy 5, 851–859 (2020). https://doi.org/10.1038/s41560-020-00687-4
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