Quadruple-cation Wide-bandgap Mixed-halide Tin Perovskite Solar Cells, ACS Energy Letters 9, 5 (2024)
Chun-Hsiao Kuan, Yu-Cheng Chen, Sudhakar Narra, Chun-Fu Chang, Yi-Wei Tsai, Jhih-Min Lin, Guan-Ruei Chen, and Eric Wei-Guang Diau*
2024/08/01
Tin-based perovskite solar cells (TPSCs) are a promising alternative to the traditional lead-based PSCs for lead-free photovoltaic applications. To further promote the performance and stability, a tandem type of TPSC is an attractive direction to pursue. To serve as a low-bandgap TPSC with the bandgap (Eg) of around 1.4 eV, searching for a high-bandgap TPSC with anEg in the range 1.8–2.0 eV is an important task to build a lead-free tandem TPSC. Herein, we report the first quadruple-cation wide-bandgap TPSC with the perovskite structure of FA0.55MA0.25Cs0.1PMA0.1SnBr2I (FA, formamidinium; MA, methylammonium; PMA, phenylmethylammonium) and an Eg of 1.93 eV to give the efficiency of power conversion of 6.2%. We found that PMA plays a key role in passivating the grain surface of perovskites and the interface between the perovskite and the hole-transport layer to give high performance and great stability for a wide-bandgap TPSC with a quadruple-cation configuration.
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