Phase‐Stable CsPbI3 Nanocrystals: The Reaction Temperature Matters,Angewandte Chemie International Edition

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Phase‐Stable CsPbI3 Nanocrystals: The Reaction Temperature Matters
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2018-06-19 , DOI: 10.1002/anie.201803701
Anirban Dutta ₁ , Sumit K. Dutta ₁ , Samrat Das Adhikari ₁ , Narayan Pradhan ₁

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High temperature colloidal synthesis for obtaining thermal, colloidal and phase‐stable CsPbI₃ nanocrystals with near‐unity quantum yield is reported. While standard perovskite synthesis reactions were carried out at 160 °C (below 200 °C), increase of another ≈100 °C enabled the alkylammonium ions to passivate the surface firmly and prevented the nanocrystals from phase transformation. This did not require any inert atmosphere storage, use of heteroatoms, specially designed ligands, or the ice cooling protocol. Either at high temperature in reaction flask or in the crude mixture or purified dispersed solution; these nanocrystals were observed stable and retained the original emission. Different spectroscopic analyses were carried out and details of the surface binding of alkyl ammonium ligands in place of surface Cs in the crystal lattice were investigated. As CsPbI₃ is one of the most demanding optical materials, bringing stability by proper surface functionalization without use of secondary additives would indeed help in wide spreading of their applications.

中文翻译：

相稳定的CsPbI3纳米晶体：反应温度很重要

高温胶体合成获得热，胶体和相稳定的CsPbI ₃据报道，纳米晶体的量子产率接近统一。虽然标准钙钛矿合成反应是在160°C（低于200°C）下进行的，但另一个≈100°C的升高使烷基铵离子牢固地钝化了表面，并阻止了纳米晶体的相变。不需要任何惰性气氛存储，使用杂原子，专门设计的配体或冰冷却方案。在高温下在反应烧瓶中或在粗混合物或纯化的分散溶液中；观察到这些纳米晶体稳定并保留了原始发射。进行了不同的光谱分析并且研究了烷基铵配体的表面结合代替晶格中的表面Cs的细节。作为CsPbI ₃ 是最苛刻的光学材料之一，通过适当的表面功能化而无需使用辅助添加剂即可带来稳定性，这确实有助于其应用的广泛推广。

更新日期：2018-06-19

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