First-principles study on optic-electronic properties of doped formamidinium lead iodide perovskite

Diao Xin-Feng^{1, 2}, Tang Yan-Lin^{3, †}, Xie Quan¹

Band structure of three crystals: (a) FA_0.75Cs_0.25Sn_0.5Pb_0.5I₃, (b) FA_0.75Cs_0.25Sn_0.5Ge_0.5I₃, and (c) FA_0.75Cs_0.25Sn_0.25Ge_0.75I₃. The band gap is (a) 1.003 eV, (b) 0.788 eV, and (c) 0.974 eV.