Lattice Dynamics and Thermal Stability of Cubic-Phase CsPbI3 Quantum Dots

	Lattice Dynamics and Thermal Stability of Cubic-Phase CsPbI3 Quantum Dots
	Wei Zhou; Fan Sui; Guohua Zhong; Guanming Cheng; Mingyue Pan; Chunlei Yang; Shuangchen Ruan
刊名	The Journal of Physical Chemistry Letters
	2018
文献子类	期刊论文
英文摘要	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, temperaturedependent 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.
URL标识	查看原文
语种	英语
内容类型	期刊论文
源URL	[http://ir.siat.ac.cn:8080/handle/172644/13480]
专题	深圳先进技术研究院_集成所
推荐引用方式 GB/T 7714	Wei Zhou,Fan Sui,Guohua Zhong,et al. Lattice Dynamics and Thermal Stability of Cubic-Phase CsPbI3 Quantum Dots[J]. The Journal of Physical Chemistry Letters,2018.
APA	Wei Zhou.,Fan Sui.,Guohua Zhong.,Guanming Cheng.,Mingyue Pan.,...&Shuangchen Ruan.(2018).Lattice Dynamics and Thermal Stability of Cubic-Phase CsPbI3 Quantum Dots.The Journal of Physical Chemistry Letters.
MLA	Wei Zhou,et al."Lattice Dynamics and Thermal Stability of Cubic-Phase CsPbI3 Quantum Dots".The Journal of Physical Chemistry Letters (2018).