Perovskite solar cells have attracted great expectation as next-generation solar cells since they were invented in 2009 due to their high power conversion efficiency (PCE), which is 25.2% in 2020, and low cost. Now methylammonium lead iodide (MAPI, CH_3NH_3PbI_3) is mainly used for a light-absorbing layer, but the toxicity of lead is the problem for commercial use. Recently, methylammonium bismuth iodide (MABI, (CH_3NH_3)_3Bi_2I_9) is attracting attention for a new perovskite material because of its low toxicity, and high durability.
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