Deciphering hot- and multi-exciton dynamics in core-shell QDs by 2D electronic spectroscopies

作者：Righetto Marcello; Bolzonello Luca; Volpato Andrea; Amoruso Giordano; Panniello Annamaria; Fanizza Elisabetta; Striccoli Marinella; Collini Elisabetta^*

来源：Physical Chemistry Chemical Physics, 2018, 20(27): 18176-18183.

DOI：10.1039/c8cp02574f

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.

• 出版日期2018-7-21