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Hybrid Lead Halide Perovskite Films with Large Grain Size Via Spin‐Coating Free Fabrication
Author(s) -
Liu Wenyan,
Ma Pengfei,
Xu Jiaying,
Wang Changhao,
Wang Chen,
Qu Minglei,
Wen Shanpeng
Publication year - 2021
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.202000650
Subject(s) - perovskite (structure) , materials science , grain size , halide , spin coating , grain boundary , space charge , thin film , nanotechnology , crystallography , electron , inorganic chemistry , composite material , chemistry , microstructure , physics , quantum mechanics
Herein, a spin‐coating‐free method to deposit CH 3 NH 3 PbI 3 perovskite films with large grains is demonstrated. The effect of processing temperature on the property of hybrid lead halide perovskite films is investigated. It is found that the grain domain size is enlarged by increasing processing temperature. Dense and uniform CH 3 NH 3 PbI 3 films with grain domain size close to 1 mm are obtained using this method. A higher processing temperature also promotes the conversion from precursors solution to perovskite, but excessive temperature induces a poor crystalline state. About 150 °C is proved to be close to the optimal processing temperature to form perovskite films with less defect density, lower charge recombination, and longer charge carrier lifetimes. Space‐charge‐limited current method is used to investigate the charge transport efficiency based on CH 3 NH 3 PbI 3 perovskite films. The results show that both the electron and hole mobility improve remarkably as the processing temperature increases.