Changes in the Photoluminescence of Monolayer and Bilayer Molybdenum Disulfide during Laser Irradiation.

ABSTRACT: Various postsynthesis processes for transition metal dichalcogenides have been attempted to control the layer number and defect concentration, on which electrical and optical properties strongly depend. In this work, we monitored changes in the photoluminescence (PL) of molybdenum disulfide (MoS₂) until laser irradiation generated defects on the sample flake and completely etched it away. Higher laser power was required to etch bilayer MoS₂ compared to monolayer MoS₂. When the laser power was 270 μW with a full width at half-maximum of 1.8 μm on bilayer MoS₂, the change in PL intensity over time showed a double maximum during laser irradiation due to a layer-by-layer etching of the flake. When the laser power was increased to 405 μW, however, bot

SUBMITTER: Kim HJ 

PROVIDER: S-EPMC7160837 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature