Inorganic wide-bandgap perovskite subcells with dipole bridge for all-perovskite tandems

Tiantian Li, Jian Xu, Renxing Lin, Sam Teale, Hongjiang Li, Zhou Liu, Chenyang Duan, Qian Zhao, Ke Xiao, Pu Wu, Bin Chen, Sheng Jiang, Shaobing Xiong, Haowen Luo, Sushu Wan, Ludong Li, Qinye Bao, Yuxi Tian, Xueping Gao, Jin Xie, Edward H. Sargent () and Hairen Tan ()
Additional contact information
Tiantian Li: Nanjing University
Jian Xu: University of Toronto
Renxing Lin: Nanjing University
Sam Teale: University of Toronto
Hongjiang Li: Nanjing University
Zhou Liu: Nanjing University
Chenyang Duan: Nanjing University
Qian Zhao: Nankai University
Ke Xiao: Nanjing University
Pu Wu: Nanjing University
Bin Chen: University of Toronto
Sheng Jiang: East China Normal University
Shaobing Xiong: East China Normal University
Haowen Luo: Nanjing University
Sushu Wan: Nanjing University
Ludong Li: Nanjing University
Qinye Bao: East China Normal University
Yuxi Tian: Nanjing University
Xueping Gao: Nankai University
Jin Xie: Nanjing University
Edward H. Sargent: University of Toronto
Hairen Tan: Nanjing University

Nature Energy, 2023, vol. 8, issue 6, 610-620

Abstract: Abstract Operating stability has become a priority issue for all-perovskite tandem solar cells. Inorganic CsPbI3−xBrx perovskites, which have good photostability against halide segregation, are promising alternatives for all-perovskite tandem solar cells. However, the interface between organic transport layers and inorganic perovskite suffers from a large energetic mismatch and inhibits charge extraction compared with hybrid analogues, resulting in low open-circuit voltages and fill factors. Here we show that inserting at this interface a passivating dipole layer having high molecular polarity—a molecule that interacts strongly with both inorganic perovskite and C60—reduces the energetic mismatch and accelerates the charge extraction. This strategy resulted in a power conversion efficiency (PCE) of 18.5% in wide-bandgap (WBG) devices. We report all-perovskite tandems using an inorganic WBG subcell, achieving a PCE of 25.6% (steady state 25.2%). Encapsulated tandems retain 96% of their initial performance after 1,000 h of simulated 1-sun operation at the maximum power point.

Date: 2023
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DOI: 10.1038/s41560-023-01250-7

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