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Annealing CsPbX3 (X = Cl and Br) Perovskite Nanocrystals at High Reaction Temperatures: Phase Change and Its Prevention
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-11-06 00:00:00 , DOI: 10.1021/acs.jpclett.8b02825 Anirban Dutta 1 , Rakesh Kumar Behera 1 , Sumit Kumar Dutta 1 , Samrat Das Adhikari 1 , Narayan Pradhan 1
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-11-06 00:00:00 , DOI: 10.1021/acs.jpclett.8b02825 Anirban Dutta 1 , Rakesh Kumar Behera 1 , Sumit Kumar Dutta 1 , Samrat Das Adhikari 1 , Narayan Pradhan 1
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Annealing perovskite nanocrystals at high reaction temperature changes their crystal phase, shape, and optical properties. Carrying out reactions between 180 and 250 °C, the impact of thermal annealing for CsPbCl3 and CsPbBr3 nanocrystals in a reaction flask was investigated here. At higher temperature, a phase change was observed instantly, which could not be trapped even with ice-bath cooling. Interestingly, using a calculated amount of preformed alkylammonium halides as dual passivating agents, the nanocrystals of both CsPbCl3 and CsPbBr3 could even be stabilized for hours of annealing at 250 °C. CsPbCl3, which was reported to be a poor emissive nanocrystal in comparison to CsPbBr3, could sustain even more than 5 h of annealing at 250 °C and recorded ∼51% absolutely quantum yield. Details of the interface chemistry and the role of the used dual passivating agent for providing thermal stability are studied and reported in this Letter.
中文翻译：
高反应温度下退火CsPbX 3（X = Cl和Br）钙钛矿纳米晶体：相变及其预防
在高反应温度下对钙钛矿纳米晶体进行退火会改变其晶体相，形状和光学性质。在180至250°C的温度范围内进行反应，研究了反应烧瓶中CsPbCl 3和CsPbBr 3纳米晶体的热退火影响。在较高的温度下，立即观察到相变，即使在冰浴冷却下也无法捕获。有趣的是，使用计算量的预制烷基卤化铵作为双重钝化剂，CsPbCl 3和CsPbBr 3的纳米晶体甚至可以在250°C的退火条件下稳定数小时。CsPbCl 3，这是据报道，相比于CsPbBr不良发射纳米晶体3可以在250°C的温度下维持超过5小时的退火，并且记录的绝对量子产率约为51％。在本函中研究并报道了界面化学的详细信息以及所用的双重钝化剂在提供热稳定性方面的作用。
更新日期：2018-11-06
中文翻译：
高反应温度下退火CsPbX 3（X = Cl和Br）钙钛矿纳米晶体：相变及其预防
在高反应温度下对钙钛矿纳米晶体进行退火会改变其晶体相，形状和光学性质。在180至250°C的温度范围内进行反应，研究了反应烧瓶中CsPbCl 3和CsPbBr 3纳米晶体的热退火影响。在较高的温度下，立即观察到相变，即使在冰浴冷却下也无法捕获。有趣的是，使用计算量的预制烷基卤化铵作为双重钝化剂，CsPbCl 3和CsPbBr 3的纳米晶体甚至可以在250°C的退火条件下稳定数小时。CsPbCl 3，这是据报道，相比于CsPbBr不良发射纳米晶体3可以在250°C的温度下维持超过5小时的退火，并且记录的绝对量子产率约为51％。在本函中研究并报道了界面化学的详细信息以及所用的双重钝化剂在提供热稳定性方面的作用。
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