Deciphering hot- and multi-exciton dynamics in core–shell QDs by 2D electronic spectroscopies. Issue 27 (2nd July 2018)

• Record Type: Journal Article
• Authors: Righetto, Marcello; Bolzonello, Luca; Volpato, Andrea; Amoruso, Giordano; Panniello, Annamaria; Fanizza, Elisabetta; Striccoli, Marinella; Collini, Elisabetta
• Is Part Of: Physical chemistry chemical physics. Volume 20:Issue 27(2018)
• Page Start: 18176
• Page End: 18183
• Publication Date: 2018-07-02
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c8cp02574f
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : 2D electronic spectroscopy maps acquired in different configurations unveil intraband hot carrier cooling and interband multi-exciton recombination dynamics. Abstract : 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.