Xiaowen Sun, Hua Fan, Xiaowei Xu, Gongqiang Li, Xiaoyu Gu, Dou Luo, Chengwei Shan, Qiong Yang, Chunyang Miao, Zheng Xie, Ping-Ping Sun, Aung Ko Ko Kyaw, Gang Lv, Shixing Dong, Dong Hwan Wang
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...
April 9, 2024: Chemistry: a European Journal