Exciton Relaxation Dynamics in Photo-Excited CsPbI3 Perovskite Nanocrystals.
Exciton Relaxation Dynamics in Photo-Excited CsPbI3 Perovskite Nanocrystals.
复制标题
光激发 CsPbI3 钙钛矿纳米晶体中的激子弛豫动力学
DOI：
10.1038/srep29442
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发表时间：
2016-07-12
影响因子：
4.6
通讯作者：
Zhang H
中科院分区：
文献类型：
--
作者：
Liu Q;Wang Y;Sui N;Wang Y;Chi X;Wang Q;Chen Y;Ji W;Zou L;Zhang H
利用瞬态吸收光谱研究了CsPbI3钙钛矿纳米晶的激子弛豫过程。通过比较CsPbI 3纳米晶体在低能和高能激子态的热释电数据，证实了CsPbI 3纳米晶体中存在热激子弛豫过程。此外，俄歇复合和本征衰变路径也参与了CsPbI3纳米晶体的弛豫过程，即使每个纳米晶体的激子数估计小于1。激发强度依赖的TA数据进一步证实了俄歇复合的存在。同时，光谱数据也证实了CsPbI3纳米粒子处于高能激子态时，在高激发强度下，热激子的质量随着俄歇复合的质量的增加而增加.
The exciton relaxation process of CsPbI3 perovskite nanocrystals (NCs) has been investigated by using transient absorption (TA) spectroscopy. The hot exciton relaxation process is confirmed to exist in the CsPbI3 NCs, through comparing the TA data of CsPbI3 NCs in low and high energy excitonic states. In addition, the Auger recombination and intrinsic decay paths also participate in the relaxation process of CsPbI3 NCs, even the number of exciton per NC is estimated to be less than 1. Excitation intensity-dependent TA data further confirms the existence of Auger recombination. Meanwhile, the spectral data also confirms that the weight of hot exciton also increase together with that of Auger recombination at high excitation intensity when CsPbI3 NCs in high energy excitonic states.