Ion-Exchange-Induced 2D-3D Conversion of HMA1-xFAxPbI3Cl Perovskite into a High-Quality MA1-xFAxPbI3Perovskite.
High-quality phase-pure MA1-xFAxPbI3planar films (MA=methylammonium, FA=formamidinium) with extended absorption and enhanced thermal stability are difficult to deposit by regular simple solution chemistry approaches owing to crystallization competition between the easy-to-crystallize but unwanted δ-FAPbI3/MAPbI3and FAxMA1-xPbI3requiring rigid crystallization conditions. Here A 2D-3D conversion to transform compact 2D mixed composition HMA1-xFAxPbI3Cl perovskite precursor films into 3D MA1-xFAxPbI3(x=0.1-0.9) perovskites is presented. The designed Cl/I and H/FA(MA) ion exchange reaction induced fast transformation of compact 2D perovskite film, helping to form the phase-pure and high quality MA1-xFAxPbI3without δ-FAPbI3and MAPbI3impurity. In all, we successfully developed a facile one-step method to fabricate high quality phase-pure MA1-xFAxPbI3(x=0.1-0.9) perovskite films by 2D-3D conversion of HMA1-xFAxPbI3Cl perovskite. This 2D-3D conversion is a promising strategy for lead halide perovskite fabrication.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China.
Ge
G
Li
School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China.
Taiyang
T
Zhang
School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China.
Nanjie
N
Guo
School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China.
Feng
F
Xu
School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China.
Xufang
X
Qian
School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China. yixin.zhao@sjtu.edu.cn.
Yixin
Y
Zhao
2D perovskites; 2D-3D conversion; ion exchange; mixed-cation perovskites; perovskite solar cells