[23a-B103-1~12] 12.5 Organic solar cells

▼ [23a-B103-2] Vapor phase deposition of lead-free halide perovskite alloy Cs(SnZn)Br₃

〇(D)Hanbo Jung¹, Zihao Liu¹, Masato Sotome², Takashi Kondo^1,2 (1.Tokyo Univ., 2.RCAST Tokyo Univ.)

Keywords:Tin halide perovskites, New alloy, B-site engineering

Lead halide perovskite solar cells have achieved the conversion efficiency comparable to that of single crystal silicon solar cells. However, the toxicity of lead and its environmental issues is preventing commercial applications. Sn halide perovskites are the most promising candidates to replace lead, since tin is abundant in nature with little health risk and Sn-perovskites have a similar crystal structure with lead-perovskites. All-inorganic CsSnBr₃ is hopeful as the base material because it has better phase stability compared to CsSnI₃ and perovskites with organic cations. On the other hand, B-site incorporation of Zn²⁺ion into lead-halide perovskites has been studied. The Zn²⁺ ion can act as a morphology controller realizing larger grain size with lesser pinholes, and tune the energy levels. Herein, CsSn_1-xZn_xBr₃ [x = 0.01 (1Zn), 0.02 (2Zn), 0.04 (4Zn)] thin films were fabricated by the vapor phase deposition