講演情報
[22p-C601-2]Vapor phase deposition of lead-free halide perovskite alloy CsSn1-xZnxBr3 II
〇(D)Hanbo Jung1, Zihao Liu1, Masato Sotome2, Takashi Kondo1,2 (1.School of Eng., Univ. of Tokyo, 2.RCAST, Univ. of Tokyo)
キーワード：
Tin halide perovskites、New alloy、B-site engineering
Lead halide perovskite solar cells have achieved remarkable power conversion efficiencies (PCEs), but their commercialization is hindered by lead's toxicity. Tin halide perovskites, particularly CsSnBr3, have emerged as a promising alternative due to tin's abundance and lower risk to human health. However, spin-coated CsSnBr3 thin films suffer from poor morphology and unwanted by-products. Previous studies on lead halide perovskites have shown that the incorporation of Zn2+ ions improves morphology and allows for tunable bandgaps. In this research, CsSn1-xZnxBr3 thin films (x = 0.01, 0.02, 0.04) were fabricated using vapor deposition. Compared to pure-CsSnBr3, the film with 4Zn incorporation exhibited a nearly pinhole-free structure, larger grain size, and reduced oxidation of Sn2+. The 4Zn also demonstrated higher absorption coefficient and narrower bandgap energy. Pure CsSnBr3 solar cells achieved a PCE of 0.76%, surpassing the 0.01% PCE of spin-coated pure-CsSnBr3 solar cells.