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Lattice Dynamics and Thermal Stability of Cubic-Phase CsPbI3 Quantum Dots
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-08-14 00:00:00 , DOI: 10.1021/acs.jpclett.8b02036
Wei Zhou 1 , Fan Sui 2 , Guohua Zhong 2 , Guanming Cheng 2 , Mingyue Pan 2 , Chunlei Yang 2 , Shuangchen Ruan 1
Affiliation  

Cubic-phase CsPbI3 quantum dots (QDs) have been recently synthesized with merits of excellent optoelectronic performance. However, vital properties of cubic CsPbI3 including lattice dynamics and stability at high temperature remain poorly explored. We fabricate cubic CsPbI3 QDs and study their lattice dynamic and thermal stability to 700 K. We obtain Raman modes of cubic CsPbI3 QDs from 300 to 500 K at ultra-low-frequency range down to 15 cm–1, consistent with first-principles calculations. Above 550 K, the modification of Raman features suggests sample degradation. Consistently, temperature-dependent photoluminescence measurements indicate the absence of other luminescence phases up to 700 K. With increasing temperature, the CsPbI3 QD photoluminescence peak has a blue shift with exponentially decreasing intensity, showing faster electronic degradation than structural degradation. Our work provides detailed investigation of CsPbI3 QD lattice dynamics, band gap, and their high-temperature behavior, potentially useful for their emerging optoelectronic applications.

中文翻译:

立方相CsPbI 3量子点的晶格动力学和热稳定性

立方相CsPbI 3量子点(QDs)最近已经合成,具有优异的光电性能。然而,立方CsPbI 3的重要特性,包括晶格动力学和高温稳定性,仍未得到很好的研究。我们制造了立方CsPbI 3 QD并研究了其在700 K时的晶格动力学和热稳定性。我们在低至15 cm –1的超低频范围内获得了300至500 K的立方CsPbI 3 QD的拉曼模式。,与第一性原理计算一致。在550 K以上,拉曼特征的改变表明样品会降解。始终如一的,与温度有关的光致发光测量结果表明,直至700 K都没有其他发光相。随着温度的升高,CsPbI 3 QD光致发光峰发生蓝移,强度呈指数下降,显示出比结构退化更快的电子降解。我们的工作提供了对CsPbI 3 QD晶格动力学,带隙及其高温行为的详细研究,可能对其新兴的光电应用有用。
更新日期:2018-08-14
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