Coupled Charge Transfer Dynamics and Photoluminescence Quenching in Monolayer MoS₂ Decorated with WS₂ Quantum Dots.

ABSTRACT: Herein, we have investigated the tunability of the photoluminescence (PL) of the monolayer MoS₂ (1L-MoS₂) by decorating it with WS₂ quantum dots (WS₂ QD). The direct bandgap 1L-MoS₂ and WS₂ QDs are grown by chemical vapor deposition and liquid exfoliation methods, respectively. The room temperature PL spectrum of bare 1L-MoS₂ is systematically quenched with its decoration with WS₂ QDs at different concentrations. A decrease in the work function of 1L-MoS₂ with the decoration of WS₂ QDs was established from the Kelvin probe force microscopy analysis. A detailed quantitative analysis using the four-energy level model involving coupled charge transfer was employed to explain the redsh

SUBMITTER: Mawlong LPL 

PROVIDER: S-EPMC6923361 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature