Controlled Growth of CH3NH3PbBr3 Perovskite Nanocrystals via a Water–Oil Interfacial Synthesis Method. Issue 49 (22nd October 2019)

• Record Type: Journal Article
• Authors: Li, Fangfang; Cao, Liya; Shi, Shuangshuang; Gao, Heng; Song, Li; Geng, Chong; Bi, Wengang; Xu, Shu
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 49(2019)
• Page Start: 17631
• Page End: 17635
• Publication Date: 2019-10-22
• Subjects: CH3NH3PbBr3 -- formation mechanisms -- interfacial synthesis -- kinetic study -- perovskite nanocrystals; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201910225
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: 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 MAPbBr3 NCs (MA=CH3 NH3 + ), which prolongs the reaction time to tens of minutes. This method makes it possible to monitor in situ the formation process of MAPbBr3 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 PbBr6 4− octahedra and the diffusion rate of MA. The formation of PbBr6 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. Abstract : Growth on the water : A comprehensive kinetic study of the growth mechanism of MAPbBr3 nanocrystals (NCs; MA=CH3 NH3 + ) is made possible through the water–oil interfacial synthesis method. The overall reaction time of MAPbBr3 NCs is thereby prolonged to tens of minutes by reducing the formation rate of PbBr6 4− octahedra and the diffusion rate of MA.