Charge transfer mechanism on MoS$_2$ nanosheets in the presence of a semiconductor photoactive media

TL;DR

This paper explores the third-order nonlinear optical properties of MoS₂ nanosheets coupled with semiconductor quantum dots, revealing mechanisms that enhance their potential for laser and short-wavelength radiation applications.

Contribution

It presents new insights into the nonlinear optical behavior of MoS₂ nanosheets functionalized with quantum dots and identifies mechanisms to modify their properties for optoelectronic uses.

Findings

Enhanced NLO properties with quantum dot functionalization

Identification of multiphoton resonance energy transfer mechanisms

Ultrafast charge transfer pathways in MoS₂ nanosheets

Abstract

The studies of the nonlinear optical (NLO) properties of the transition metal dichalcogenides (TMDs) coupled with photoactive particles, plasmonic nanocavities, waveguides, and metamaterials remain in their infancy. This study investigates the third-order NLO properties of MoS$_2$ nanosheets in the presence of a semiconductor photoactive medium. Our extensive studies and the obtained results reveal the counteractive coupling effect of bare and passivated quantum dots on the MoS$_2$ nanosheet, as made evident by the analysis of the NLO processes. The enhanced NLO properties of MoS$_2$ nanosheets functionalized with CdSe and CdSe-V2O5 quantum dots are helpful for applications as saturable absorbers in laser applications and the emission of coherent short-wavelength radiation. The multiphoton-excitation resonance energy transfer mechanism exploiting remote dipole dipole coupling, and ultrafast charge transfer pathways emerges as another plausible way to alter the NLO properties in TMDs.