Quadruple-Cation Wide-Bandgap Mixed-Halide Tin Perovskite Solar Cells
Chun‐Hsiao Kuan, Yu‐Cheng Chen, Sudhakar Narra, C. Chang, Yi‐Wei Tsai, Jhih‐Min Lin, Guan‐Ruei Chen, Eric Wei‐Guang Diau
Abstract
High Resolution Image Download MS PowerPoint Slide 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 ( E g ) of around 1.4 eV, searching for a high-bandgap TPSC with an E g 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 FA 0.55 MA 0.25 Cs 0.1 PMA 0.1 SnBr 2 I (FA, formamidinium; MA, methylammonium; PMA, phenylmethylammonium) and an E g 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.