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Deciphering hot- and multi-exciton dynamics in core–shell QDs by 2D electronic spectroscopies†
Physical Chemistry Chemical Physics ( IF 3.3 ) Pub Date : 2018-07-02 00:00:00 , DOI: 10.1039/c8cp02574f
Marcello Righetto 1, 2, 3, 4 , Luca Bolzonello 1, 2, 3, 4 , Andrea Volpato 1, 2, 3, 4 , Giordano Amoruso 1, 2, 3, 4 , Annamaria Panniello 4, 5, 6, 7, 8 , Elisabetta Fanizza 4, 5, 6, 7, 8 , Marinella Striccoli 4, 5, 6, 7, 8 , Elisabetta Collini 1, 2, 3, 4
Affiliation  

Although the harnessing of multiple and hot excitons is a prerequisite for many of the groundbreaking applications of semiconductor quantum dots (QDs), the characterization of their dynamics through conventional spectroscopic techniques is cumbersome. Here, we show how a careful analysis of 2DES maps acquired in different configurations (BOXCARS and pump–probe geometry) allows the tracking and visualization of intraband Auger relaxation mechanisms, driving the hot carrier cooling, and interband bi- and tri-exciton recombination dynamics. The results obtained on archetypal core–shell CdSe/ZnS QDs suggest that, given the global analysis of the resulting datasets, 2D electronic spectroscopy techniques can successfully and efficiently dispel the intertwined dynamics of fast and ultrafast recombination processes in nanomaterials. Hence, we propose this analysis scheme to be used in future research on novel quantum confined systems.

中文翻译:

通过二维电子光谱学分析核壳型量子点中的热激子和多激子动力学

尽管利用多种激子和热激子是半导体量子点(QD)的许多突破性应用的先决条件,但通过常规光谱技术表征其动力学的过程却很繁琐。在这里,我们展示了如何仔细分析以不同配置(BOXCARS和泵浦探针几何结构)获取的2DES映射图,从而可以跟踪和可视化带内俄歇弛豫机制,驱动热载流子冷却以及带间双激子和三激子复合动力学。在原型核壳CdSe / ZnS量子点上获得的结果表明,鉴于对所得数据集的整体分析,二维电子光谱技术可以成功,有效地消除纳米材料中快速和超快速重组过程的相互纠缠的动力学。因此,
更新日期:2018-07-02
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