Reducing Defects in Halide Perovskite Nanocrystals for Light-Emitting Applications,The Journal of Physical Chemistry Letters

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Reducing Defects in Halide Perovskite Nanocrystals for Light-Emitting Applications
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2019-04-30 00:00:00 , DOI: 10.1021/acs.jpclett.9b00689
Xiaopeng Zheng ₁ , Yi Hou ₂ , Hong-Tao Sun ₃ , Omar F. Mohammed ₁ , Edward H. Sargent ₂ , Osman M. Bakr ₁

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The large specific surface area of perovskite nanocrystals (NCs) increases the likelihood of surface defects compared to that of bulk single crystals and polycrystalline thin films. It is thus crucial to comprehend and control their defect population in order to exploit the potential of perovskite NCs. This Perspective describes and classifies recent advances in understanding defect chemistry and avenues toward defect density reduction in perovskite NCs, and it does so in the context of the promise perceived in light-emitting devices. Several pathways for decreasing the defect density are explored, including advanced NC syntheses, new surface-capping strategies, doping with metal ions and rare earths, engineering elemental compensation, and the translation of core–shell heterostructures into the perovskite materials family. We close with challenges that remain in perovskite NC defect research.

中文翻译：

减少用于发光应用的卤化物钙钛矿纳米晶体中的缺陷

与块状单晶和多晶薄膜相比，钙钛矿纳米晶体（NCs）的大比表面积增加了表面缺陷的可能性。因此，至关重要的是理解和控制其缺陷数量，以开发钙钛矿NC的潜力。本“观点”描述并分类了钙钛矿型NC中了解缺陷化学和降低缺陷密度的途径的最新进展，并且它是在发光设备中获得应许的前提下进行的。探索了降低缺陷密度的几种途径，包括先进的NC合成，新的表面覆盖策略，金属离子和稀土元素的掺杂，工程元素补偿以及核-壳异质结构转化为钙钛矿材料族。

更新日期：2019-04-30

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