Oxidation-resistant all-perovskite tandem solar cells in substrate configuration
Date
2023
Authors
Wang, Yurui
Lin, Renxing
Wang, Xiaoyu
Liu, Chenshuaiyu
Ahmed, Yameen
Huang, Zilong
Zhang, Zhibin
Li, Hongjiang
Zhang, Mei
Gao, Yuan
Journal Title
Journal ISSN
Volume Title
Publisher
Nature Communications
Abstract
The commonly-used superstrate configuration (depositing front subcell first and then depositing back subcell) in all-perovskite tandem solar cells is disadvantageous for long-term stability due to oxidizable narrow-bandgap perovskite assembled last and easily exposable to air. Here we reverse the processing order and demonstrate all-perovskite tandems in a substrate configuration (depositing back subcell first and then depositing front subcell) to bury oxidizable narrow-bandgap perovskite deep in the device stack. By using guanidinium tetrafluoroborate additive in wide-bandgap perovskite subcell, we achieve an efficiency of 25.3% for the substrate-configured all-perovskite tandem cells. The unencapsulated devices exhibit no performance degradation after storage in dry air for 1000 hours. The substrate configuration also widens the choice of flexible substrates: we achieve 24.1% and 20.3% efficient flexible all-perovskite tandem solar cells on copper-coated polyethylene naphthalene and copper metal foil, respectively. Substrate configuration offers a promising route to unleash the commercial potential of all-perovskite tandem solar cells.
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Citation
Wang, Y., Lin, R., Wang, X., Liu, C., Ahmed, Y., Huang, Z., Zhang, Z., Li, H., Zhang, M., Gao, Y., Luo, H., Wu, P., Gao, H., Zheng, X., Li, M., Liu, Z., Kong, W., Li, L., Liu, K., . . . Tan, H. (2023). Oxidation-resistant all-perovskite tandem solar cells in substrate configuration. Nature Communications, 14(1). https://doi.org/10.1038/s41467-023-37492-y