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Molecularly Tailored SnO2/Perovskite Interface Enabling Efficient and Stable FAPbI3 Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-02-10 , DOI: 10.1021/acsenergylett.1c02545 Yang Zhang 1 , Tengfei Kong 1 , Haibing Xie 1 , Jing Song 1 , Yahong Li 1 , Yuquan Ai 1 , Yipeng Han 1 , Dongqin Bi 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-02-10 , DOI: 10.1021/acsenergylett.1c02545 Yang Zhang 1 , Tengfei Kong 1 , Haibing Xie 1 , Jing Song 1 , Yahong Li 1 , Yuquan Ai 1 , Yipeng Han 1 , Dongqin Bi 1
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Pure FAPbI3 (where FA is formamidinium) based perovskite solar cells (PSCs) have drawn tremendous attention because of their exceptional photovoltaic properties, although long-term stability is still a big challenge. Molecular tailoring is one of the practical approaches to enhancing the stability of FAPbI3 by passivating the film defects; however, deep understanding of how the molecular configuration affects the adjacent layer in FAPbI3 PSCs is urgently needed. Herein, we report a strategy of molecularly tailoring the FAPbI3/SnO2 interface by employing three Li salts by varying the anion configurations (CO32–, C2O42–, and HCOO–). When C–O and C=O groups are in optimal configuration, they will form the strongest bonds with uncoordinated Sn4+ and FA+, respectively, which can increase the formation energy of VFA defects, release the residual stress of the FAPbI3 lattice, facilitate the charge transport at the FAPbI3/SnO2 interface, and improve the stability of the PSC. Consequently, we obtained a champion device with a power conversion efficiency of 23.5%, and the unencapsulated device can maintain good stability under continuous light illumination.
中文翻译：
分子定制的 SnO2/钙钛矿界面可实现高效稳定的 FAPbI3 太阳能电池
纯 FAPbI 3（其中 FA 是甲脒）基钙钛矿太阳能电池（PSC）因其卓越的光伏特性而引起了极大的关注，尽管长期稳定性仍然是一个巨大的挑战。分子剪裁是通过钝化膜缺陷来提高FAPbI 3稳定性的实用方法之一；然而，迫切需要深入了解分子构型如何影响 FAPbI 3 PSC 中的相邻层。在此，我们报告了一种通过改变阴离子构型（CO 3 2-、C 2 O 4 2-, 和 HCOO – )。当C-O和C=O基团处于最佳构型时，它们将分别与未配位的Sn 4+和FA +形成最强的键，这可以增加V FA缺陷的形成能，释放FAPbI 3的残余应力晶格，促进FAPbI 3 /SnO 2界面的电荷传输，提高PSC的稳定性。因此，我们获得了功率转换效率为 23.5% 的冠军器件，并且未封装的器件在连续光照下仍能保持良好的稳定性。
更新日期：2022-02-10
中文翻译：
分子定制的 SnO2/钙钛矿界面可实现高效稳定的 FAPbI3 太阳能电池
纯 FAPbI 3（其中 FA 是甲脒）基钙钛矿太阳能电池（PSC）因其卓越的光伏特性而引起了极大的关注，尽管长期稳定性仍然是一个巨大的挑战。分子剪裁是通过钝化膜缺陷来提高FAPbI 3稳定性的实用方法之一；然而，迫切需要深入了解分子构型如何影响 FAPbI 3 PSC 中的相邻层。在此，我们报告了一种通过改变阴离子构型（CO 3 2-、C 2 O 4 2-, 和 HCOO – )。当C-O和C=O基团处于最佳构型时，它们将分别与未配位的Sn 4+和FA +形成最强的键，这可以增加V FA缺陷的形成能，释放FAPbI 3的残余应力晶格，促进FAPbI 3 /SnO 2界面的电荷传输，提高PSC的稳定性。因此，我们获得了功率转换效率为 23.5% 的冠军器件，并且未封装的器件在连续光照下仍能保持良好的稳定性。
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