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Highly Thermostable and Efficient Formamidinium‐Based Low‐Dimensional Perovskite Solar Cells
Author(s) -
Cheng Lei,
Liu Zhou,
Li Shunde,
Zhai Yufeng,
Wang Xiao,
Qiao Zhi,
Xu Qiaofei,
Meng Ke,
Zhu Zhiyuan,
Chen Gang
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202006970
Subject(s) - formamidinium , perovskite (structure) , halide , thermal stability , materials science , energy conversion efficiency , photovoltaic system , chemical engineering , chemistry , crystallography , inorganic chemistry , optoelectronics , organic chemistry , engineering , ecology , biology
Currently, most two‐dimensional (2D) metal halide perovskites are of the Ruddlesden–Popper type and contain the thermally unstable methylammonium (MA) molecules, which leads to inferior photovoltaic performance and mild stability. Here we report a new type of MA‐free formamidinium (FA) based low‐dimensional perovskites, featuring a general formula of (PDA)(FA) n −1 Pb n I 3 n +1 with propane‐1,3‐diammonium (PDA) as the organic spacer cation. The perovskite films with well‐oriented crystal grains are attained under the assistance of the FACl additive, where the role of Cl is investigated through the grazing‐incidence X‐ray diffraction technique. The photovoltaic device based on the optimized (PDA)(FA) 3 Pb 4 I 13 film demonstrates a remarkable power conversion efficiency of 13.8 %, the highest record for the FA‐based 2D perovskite solar cells. In addition, compared to (PDA)(MA) 3 Pb 4 I 13 , the MA‐containing analogue and a renowned stable 2D perovskite, both the (PDA)(FA) 3 Pb 4 I 13 films and their derived devices exhibit exceedingly higher thermal stability.