Difluorine-substituent tailored roles of aromatic monoammonium cations on the perovskite surface

Yang Liu,Junxue Guo, Yuping Long,Hongpeng Zhou,Hai-Qiao Wang,Jiaxing Song

CHEMICAL ENGINEERING JOURNAL（2023）

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摘要

•Substituent tailored roles of aromatic monoammonium cations on perovskite surface is elucidated.•Benzylammonium (BA) can construct random two-dimensional (2D) perovskites on perovskite surface.•Difluorinated BA (DFBA) directly interact with 3D perovskites on film surface.•DFBA/3D perovskite solar cells offers PCE of 20.29 % (MAPbI3) and 24.02 % (FAPbI3).

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关键词

Perovskite solar cells,Surface defect,Defect passivation,Substituent effect,Charge extraction

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