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Manipulation of Perovskite Crystallization Kinetics via Lewis Base Additives
Author(s) -
Xu Chenzhe,
Zhang Zheng,
Zhang Suicai,
Si Haonan,
Ma Shuangfei,
Fan Wenqiang,
Xiong Zhaozhao,
Liao Qingliang,
Sattar Abdul,
Kang Zhuo,
Zhang Yue
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202009425
Subject(s) - crystallization , materials science , perovskite (structure) , chemical engineering , lewis acids and bases , kinetics , phase (matter) , base (topology) , crystal (programming language) , crystallography , organic chemistry , chemistry , catalysis , computer science , mathematical analysis , physics , mathematics , quantum mechanics , engineering , programming language
The Lewis acid–base adduct approach has been widely used to form high‐crystalline perovskite films, but the complicated crystallization pathway and underlying film formation mechanism are still ambiguous. Here, the detailed crystallization process of perovskites manipulated by Lewis base additives has been revealed by in situ X‐ray scattering measurements. Through monitoring the film formation process, two distinct crystal growth stages have been definitely recognized: i) an intermediate phase‐dominated stage; and ii) a phase transformation stage from intermediates to crystalline perovskite phase. Incorporating Lewis base additives significantly prolongs the duration of stage 1 and induces a postponed phase transformation pathway, which could be responsible for retardant crystallization kinetics. Based on a series of experimental results and theoretical calculations, it is indicated that the manipulation of perovskite crystallization pathway is a result of the modulated molecular interactions between Lewis base additives and solution precursors. Owing to the retardant crystallization kinetics, enhanced‐quality perovskite films with reduced defect density and improved optoelectronic properties, as well as optimized photovoltaic performance have been demonstrated. This work provides in‐depth understanding with respect to perovskite crystallization pathway modulated by Lewis base additives and perceptive guidelines for precise regulation of crystallization kinetics of perovskite film toward high performance.