Assessment for Anion-Exchange Reaction in CsPbX3 (X = Cl, Br, I) Nanocrystals from Bond Strength of Inorganic Salt

Wenzhen Lv, Xingxing Tang, Ling Li, Ligang Xu, Mingguang Li, Runfeng Chen, Wei Huang

科研成果: 期刊稿件文章同行评审

34 引用 (Scopus)

摘要

Anion exchange via inorganic halide precursors is a highly efficient protocol to tune the chemical composition and optoelectronic properties of colloidal cesium lead halide perovskite (CsPbX3, X = Cl, Br, I) nanocrystals (NCs). However, a simple predication rule of precursors is lacking owing to limited understanding of these used halide compounds. Here, we first use the inorganic magnesium halide (MgX2) as a precursor to understand the halide exchange in CsPbBr3 NCs. The samples with Br- exchanged with Cl- or I- display a perfect preservation of cubic morphology, good stability, and high photoluminescence quantum yield. Then, by selecting a series of inorganic metal halide salts with different bond strength as precursors, we further find that the reaction exhibits thermal dynamic driving characteristics and the small energy difference in bonding strength between metal-X in halide salt and Pb-Br in CsPbBr3 NCs is advantageous for the anion exchange according to the vacancy diffusion mechanism. These findings illustrate an easy way to assess the feasibility of the anion-exchange reaction, significantly promoting the synthesis of compositionally diverse metal halide perovskite NCs with various optoelectronic properties.

源语言英语
页(从-至)24313-24320
页数8
期刊Journal of Physical Chemistry C
123
39
DOI
出版状态已出版 - 3 10月 2019

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