Regulating the Surface Passivation and Residual Strain in Pure Tin Perovskite Films,ACS Energy Letters

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Regulating the Surface Passivation and Residual Strain in Pure Tin Perovskite Films
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-09-15 , DOI: 10.1021/acsenergylett.1c01575
Manman Hu ₁ , Riming Nie ₁ , Hyeonwoo Kim ₁ , Jianchang Wu ₂ , Shanshan Chen ₃ , Byung-wook Park ₁ , Gwisu Kim ₁ , Hyoung-Woo Kwon ₁ , Sang Il Seok ₁

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The passivation of electronic defects at the surfaces and grain boundaries of perovskite materials is one of the most important strategies for suppressing charge recombination in perovskite solar cells (PSCs). Although several passivation molecules have been investigated, few studies have focused on their application in regulating both the surface passivation and residual strain of perovskite films. In this study, the residual strain distribution profiles of the Cs_0.1FA_0.9SnI₃ perovskite thin films and their effect on the photovoltaic device efficiencies were investigated. We found a gradient distribution of the out-of-plane compressive strain that correlated with the compositional inhomogeneity perpendicular to the substrate surface. By deliberately engineering dual effects of the surface passivation and residual strain, we achieved a record power conversion efficiency of up to 9.06%, the highest ever reported in a typical n–i–p architecture.

中文翻译：

调节纯锡钙钛矿薄膜的表面钝化和残余应变

钙钛矿材料表面和晶界处电子缺陷的钝化是抑制钙钛矿太阳能电池（PSC）中电荷复合的最重要策略之一。尽管已经研究了几种钝化分子，但很少有研究关注它们在调节钙钛矿薄膜的表面钝化和残余应变方面的应用。在本研究中，Cs _0.1 FA _0.9 SnI ₃的残余应变分布曲线研究了钙钛矿薄膜及其对光伏器件效率的影响。我们发现了与垂直于基板表面的成分不均匀性相关的面外压缩应变的梯度分布。通过有意设计表面钝化和残余应变的双重效应，我们实现了高达 9.06% 的创纪录功率转换效率，这是有史以来在典型 n-i-p 架构中报告的最高效率。

更新日期：2021-10-08

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