Zhang Jian, Hu Liping, Cao Wei, Dong Yayu, Xia Debin, Lin Kaifeng, Yang Yulin
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China.
Inorg Chem. 2023 Jul 24;62(29):11690-11700. doi: 10.1021/acs.inorgchem.3c01618. Epub 2023 Jul 12.
The photovoltaic performance of perovskite solar cells is severely limited by the innate defects of perovskite films. Metal-organic framework (MOF)-based additives with luxuriant skeleton structures and tailored functional groups show a huge potential to solve these problems. Here, a multilateral passivation strategy is performed by introducing two alkyl-sulfonic acid functionalized MOFs, MIL-88B-1,3-SOH and MIL-88B-1,4-SOH, respectively, obtained from MIL-88B-NH through a post-synthetic process, for coordinating the lead defects and inhibiting non-radiative recombination. The flexible MIL-88B-type frameworks endow both functionalized MOFs with excellent electrical conductivity and preferable carrier transport in the hole-transport materials. Compared with the original MIL-88B-NH and MIL-88B-1,4-SOH, MIL-88B-1,3-SOH exhibits optimal steric hindrance and multiple passivation groups (-NH, -NH-, and -SOH), achieving the champion doped device with an enhanced power conversion efficiency (PCE) of 22.44% and excellent stability, which maintains 92.8% of the original PCE under ambient conditions (40% humidity and 25 °C) for 1200 h.
钙钛矿太阳能电池的光伏性能受到钙钛矿薄膜固有缺陷的严重限制。具有丰富骨架结构和定制官能团的金属有机框架（MOF）基添加剂在解决这些问题方面显示出巨大潜力。在此，通过分别引入两种经后合成过程从MIL-88B-NH获得的烷基磺酸官能化MOF，即MIL-88B-1,3-SOH和MIL-88B-1,4-SOH，实施多边钝化策略，以配位铅缺陷并抑制非辐射复合。柔性的MIL-88B型框架赋予两种官能化MOF优异的导电性以及在空穴传输材料中较好的载流子传输性能。与原始的MIL-88B-NH和MIL-88B-1,4-SOH相比，MIL-88B-1,3-SOH表现出最佳的空间位阻和多个钝化基团（-NH、-NH-和-SOH），实现了冠军掺杂器件，其功率转换效率（PCE）提高到22.44%，且具有出色的稳定性，在环境条件（40%湿度和25°C）下1200小时内保持原始PCE的92.8%。
