锡
卤化物
三氟甲磺酸
钙钛矿(结构)
结晶度
成核
材料科学
胡须
化学工程
能量转换效率
Crystal(编程语言)
SN2反应
无机化学
化学
光电子学
结晶学
催化作用
有机化学
冶金
计算机科学
复合材料
工程类
程序设计语言
作者
Chunxiao Gao,X. L. Wang,Qingyun Yang,Chunxiao Gao,Xizhe Liu
标识
DOI:10.1021/acs.jpclett.4c01097
摘要
Tin-based perovskite solar cells (Sn-PSCs) without toxic lead ions outperform other types of lead-free PSCs in terms of photovoltaic performance. To avoid the oxidation of Sn2+ cations and the formation of vacancy defects, most reports involve the addition of SnF2 to the perovskite precursor solution, but hybrid tin halide (Sn-PVK) films still suffer from poor crystallinity and stability. In this work, we used an alternative additive of tin trifluoromethanesulfonate (Sn(OTF)2). Compared to SnF2, the solubility of Sn(OTF)2 in the precursor solution is greatly improved, and the crystal nucleation process is delayed, resulting in the enhancement of crystal growth. The coordination ability of the OTF– anions suppresses the oxidation of Sn2+ cations, which promotes the stability of Sn-PVK films. By replacing the conventional additive of SnF2 with Sn(OTF)2, the device achieves an increase in power conversion efficiency from 7.96% to 10.3%, while the stability of the devices is improved simultaneously.
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