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Controlled Growth of CH 3 NH 3 PbBr 3 Perovskite Nanocrystals via a Water–Oil Interfacial Synthesis Method
Author(s) -
Li Fangfang,
Cao Liya,
Shi Shuangshuang,
Gao Heng,
Song Li,
Geng Chong,
Bi Wengang,
Xu Shu
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201910225
Subject(s) - chemistry , halide , nanocrystal , perovskite (structure) , diffusion , reaction rate , kinetics , mass transfer , octahedron , inorganic chemistry , chemical engineering , catalysis , crystallography , crystal structure , thermodynamics , organic chemistry , chromatography , physics , quantum mechanics , engineering
Fundamental insights into the reaction kinetics of organic–inorganic lead halide perovskite nanocrystals (LHP NCs) are still limited due to their ultrafast formation rate. Herein, we develop a water–oil interfacial synthesis of MAPbBr 3 NCs (MA=CH 3 NH 3 + ), which prolongs the reaction time to tens of minutes. This method makes it possible to monitor in situ the formation process of MAPbBr 3 NCs and observe successive spectral evolutions from 438 to 534 nm in a single reaction by extending reaction time. The implementation of this method depends on reducing the formation rate of PbBr 6 4− octahedra and the diffusion rate of MA. The formation of PbBr 6 4− is a rate‐determining step, and the biphasic system offers a favorable reaction condition to control the mass transfer of MA. The effects of temperature and concentration of precursor and ligand are investigated in detail.