钙钛矿(结构)
锚固
能量转换效率
接受者
苯甲酸
分子
材料科学
结晶
化学工程
相对湿度
图层(电子)
小分子
化学
纳米技术
结晶学
有机化学
光电子学
结构工程
工程类
生物化学
物理
热力学
凝聚态物理
作者
Xiaowen Sun,Hua Fan,Xianbin Xu,Gongqiang Li,Xiaolei Gu,Dou Luo,Chengwei Shan,Qian Yang,Chunyang Miao,Zheng Xie,Pingping Sun,Aung Ko Ko Kyaw,Gang Liu,Shaohua Dong,Dong Hwan Wang
标识
DOI:10.1002/chem.202400629
摘要
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 N2 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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