All-Optical Reversible Manipulation of Exciton and Trion Emissions in Monolayer WS2.

ABSTRACT: Monolayer transition metal dichalcogenides (TMDs) are direct gap semiconductors with promising applications in diverse optoelectronic devices. To improve devices' performance, recent investigations have been systematically focused on the tuning of their optical properties. However, an all-optical approach with the reversible feature is still a challenge. Here we demonstrate the tunability of the photoluminescence (PL) properties of monolayer WS2 via laser irradiation. The broad-range and continuous modulation of PL intensity, as well as the conversion between neutral and charged excitons have been readily and reversibly achieved by only switching the two laser power densities. We attribute the reversible manipulation to the laser-assisted adsorption and desorption of gas molecules, which w

SUBMITTER: Yang C 

PROVIDER: S-EPMC7023460 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature