结晶度
能量转换效率
化学工程
钙钛矿(结构)
锡
材料科学
路易斯酸
SN2反应
化学
催化作用
光电子学
有机化学
工程类
作者
M. Abdel‐Shakour,Kiyoto Matsuishi,Towhid H. Chowdhury,Ashraful Islam
标识
DOI:10.1016/j.solmat.2023.112241
摘要
The exceptional photovoltaic properties of Sn-based perovskite solar cells (Sn–PSCs) have caught the interest of researchers as a potential candidate for the development of non-toxic PSCs. Nevertheless, the Sn–PSCs still face some critical drawbacks, such as the easier oxidation of Sn2+ to Sn4+ and the moisture permeation, which reduce their stability and power conversion efficiency (PCE). In this work, to tackle these limitations, we added a Lewis base additive formamidinesulfinic acid (FASO2H) to the perovskite precursor solution. The FASO2H Lewis base additive could successfully reduce the oxidation of Sn2+/Sn4+ by 32%, improved the crystallinity and decreased the lattice strain by 66% in the respective films. As a result, the charge carrier recombination minimized and the FASnI3-FASO2H (3 mol%) based PSCs produced a PCE of 7.44%. The FASO2H additive also offers superior moisture protection for Sn–PSCs thanks to its hydrophobic sulfinic acid group. Notably, the Sn–PSCs exhibit a high light soaking stability by maintaining 90% of the initial PCE up to 450 h when tested under maximum power point tracking conditions.
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