微晶
成核
结晶
材料科学
结晶度
退火(玻璃)
化学工程
活化能
钝化
硫脲
粒度
晶体生长
钙钛矿(结构)
表面能
动力学
结晶学
纳米技术
化学
物理化学
复合材料
冶金
有机化学
物理
图层(电子)
量子力学
工程类
作者
Yang Sun,Xinli Wang,Xinyue Wang,Jie Gao,Yi Wang,Xi-Cheng Ai,Jianping Zhang
标识
DOI:10.1002/cphc.202200581
摘要
Preparation of lead halide perovskite polycrystalline films at a low annealing temperature is highly restricted by their intrinsically large crystallization activation energy, which hinders the conversion of the precursors/intermediates to perovskites and yields as-prepared polycrystals with tiny grain sizes and terrible crystal quality. Herein, we demonstrate through in-situ, real-time spectroscopic studies that both the nucleation and crystal growth kinetics can be improved without the need for a high annealing temperature by treating the film with thiourea, as accounted for by the reduced activation energy. As a consequence, the thiourea-treated perovskite polycrystalline film exhibits larger grain sizes and greater crystallinity than the untreated one. More importantly, owing to the synergistic effect of the promoted crystallization kinetics and the passivation of surface defects, the low-temperature prepared films treated with thiourea even present more prominent photophysical properties than those fabricated by using the conventional high-temperature method. The strategy of crystallization kinetics engineering proposed in this work paves the way for fabricating high-quality perovskite polycrystalline films in a low-temperature manner.
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