钙钛矿(结构)
锚固
群(周期表)
分子
材料科学
化学工程
化学
有机化学
结构工程
工程类
作者
Xiaowen Sun,Hua Fan,Xiaowei Xu,Gongqiang Li,Xiaoyu Gu,Dou Luo,Chengwei Shan,Qiong Yang,Shixing Dong,Chunyang Miao,Zheng Xie,Gang Lü,Dong Hwan Wang,Pingping Sun,Aung Ko Ko Kyaw
标识
DOI:10.1002/chem.202400629
摘要
Abstract Herein, we synthesized two donor‐acceptor (D‐A) type small organic molecules with self‐assembly properties, namely MPA‐BT‐BA and MPA‐2FBT‐BA, both containing a low acidity anchoring group, benzoic acid. After systematically investigation, it is found that, with the fluorination, the MPA‐2FBT‐BA demonstrates a lower highest occupied molecular orbital (HOMO) energy level, higher hole mobility, higher hydrophobicity and stronger interaction with the perovskite layer than that of MPA‐BT‐BA. As a result, the device based‐on MPA‐2FBT‐BA displays a better crystallization and morphology of perovskite layer with larger grain size and less non‐radiative recombination. Consequently, the device using MPA‐2FBT‐BA as hole transport material achieved the power conversion efficiency (PCE) of 20.32 % and remarkable stability. After being kept in an N 2 glove box for 116 days, the unsealed PSCs’ device retained 93 % of its initial PCE. Even exposed to air with a relative humidity range of 30±5 % for 43 days, its PCE remained above 91 % of its initial condition. This study highlights the vital importance of the fluorination strategy combined with a low acidity anchoring group in SAMs, offering a pathway to achieve efficient and stable PSCs.
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