Charge and energy transfer dynamics in single colloidal quantum dots/monolayer MoS2 heterostructures

Bin Li; Yuke Gao; Ruixiang Wu; Xiangyang Miao; Guofeng Zhang

doi:10.1039/d2cp05771a

Charge and energy transfer dynamics in single colloidal quantum dots/monolayer MoS₂ heterostructures

Phys Chem Chem Phys. 2023 Mar 15;25(11):8161-8167. doi: 10.1039/d2cp05771a.

Authors

Bin Li^{1

2}, Yuke Gao¹, Ruixiang Wu¹, Xiangyang Miao¹, Guofeng Zhang²

Affiliations

¹ Key Laboratory of Spectral Measurement and Analysis of Shanxi Province, College of Physics and Information Engineering, Shanxi Normal University, Taiyuan, 030031, China. xymiao@sxnu.edu.cn.
² State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, 030006, China. guofeng.zhang@sxu.edu.cn.

PMID: 36880256
DOI: 10.1039/d2cp05771a

Abstract

The charge and energy transfer dynamics in colloidal CdSeTe/ZnS quantum dots (QDs)/monolayer molybdenum disulfide (MoS₂) heterostructures have been investigated by time-resolved single-dot photoluminescence (PL) spectroscopy. A time-gated method is used to separate the PL photons of single QDs from the PL photons of monolayer MoS₂, which are impossible to be separated by the spectral filter due to their spectral overlap. It is found that the energy transfer from MoS₂ to single QDs increases the exciton generation of the QDs by 37.5% and the energy transfer from single QDs to MoS₂ decreases the PL quantum yield of the QDs by 66.9%. In addition, it is found that MoS₂ increases the discharging rate of single QDs by 59%, while the charging rate remains unchanged. This investigation not only provides valuable insight into the exciton generation and recombination at the single-dot level across such hybrid 0D-2D interfaces but also promotes the application of the hybrid system in various optoelectronic devices.