Oxidation-resistant all-perovskite tandem solar cells in substrate configuration

Yurui Wang, Renxing Lin, Xiaoyu Wang, Chenshuaiyu Liu, Yameen Ahmed, Zilong Huang, Zhibin Zhang, Hongjiang Li, Mei Zhang, Yuan Gao, Haowen Luo, Pu Wu, Han Gao, Xuntian Zheng, Manya Li, Zhou Liu, Wenchi Kong, Ludong Li, Kaihui Liu, Makhsud I. Saidaminov, Lijun Zhang and Hairen Tan ()
Additional contact information
Yurui Wang: Nanjing University
Renxing Lin: Nanjing University
Xiaoyu Wang: Jilin University
Chenshuaiyu Liu: Nanjing University
Yameen Ahmed: University of Victoria
Zilong Huang: Nanjing University
Zhibin Zhang: Peking University
Hongjiang Li: Nanjing University
Mei Zhang: Nanjing University
Yuan Gao: Nanjing University
Haowen Luo: Nanjing University
Pu Wu: Nanjing University
Han Gao: Nanjing University
Xuntian Zheng: Nanjing University
Manya Li: Nanjing University
Zhou Liu: Nanjing University
Wenchi Kong: Nanjing University
Ludong Li: Nanjing University
Kaihui Liu: Peking University
Makhsud I. Saidaminov: University of Victoria
Lijun Zhang: Jilin University
Hairen Tan: Nanjing University

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-37492-y

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