Revealing the Formation Mechanism of CsPbBr3 Perovskite Nanocrystals Produced via a Slowed‐Down Microwave‐Assisted Synthesis,Angewandte Chemie International Edition

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Revealing the Formation Mechanism of CsPbBr3 Perovskite Nanocrystals Produced via a Slowed‐Down Microwave‐Assisted Synthesis
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2018-04-19 , DOI: 10.1002/anie.201713332
Yanxiu Li ₁ , He Huang ₁ , Yuan Xiong ₁ , Stephen V. Kershaw ₁ , Andrey L. Rogach ₁

Affiliation

We developed a microwave‐assisted slowed‐down synthesis of CsPbBr₃ perovskite nanocrystals, which retards the reaction and allows us to gather useful insights into the formation mechanism of these nanoparticles, by examining the intermediate stages of their growth. The trends in the decay of the emission intensity of CsPbBr₃ nanocrystals under light exposure are well correlated with their stability against decomposition in TEM under electron beam. The results show the change of the crystal structure of CsPbBr₃ nanocrystals from a deficient and easier to be destroyed lattice to a well crystallized one. Conversely the shift in the ease of degradation sheds light on the formation mechanism, indicating first the formation of a bromoplumbate ionic scaffold, with Cs‐ion infilling lagging a little behind. Increasing the cation to halide ratio towards the stoichiometric level may account for the improved radiative recombination rates observed in the longer reaction time materials.

中文翻译：

揭示了慢速微波辅助合成产生的CsPbBr3钙钛矿纳米晶体的形成机理

我们开发了微波辅助的CsPbBr ₃钙钛矿纳米晶体的减慢合成方法，该方法可延缓反应，并通过检查其生长的中间阶段，使我们能够深入了解这些纳米颗粒的形成机理。CsPbBr ₃纳米晶体在光照射下发射强度的衰减趋势与其在电子束下对TEM分解的稳定性相关。结果表明，CsPbBr ₃的晶体结构发生了变化。纳米晶体从缺乏晶格且易于破坏的晶格转变为结晶良好的晶格。相反，降解难易程度的变化为形成机理提供了线索，首先表明形成了溴铅酸根离子支架，而Cs离子的填充却滞后了一点。将阳离子与卤化物之比增加至化学计量水平可解释在更长的反应时间材料中观察到的改善的辐射复合速率。

更新日期：2018-04-19

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