Formation of Brightly Luminescent MoS₂ Nanoislands from Multilayer Flakes via Plasma Treatment and Laser Exposure.

ABSTRACT: A robust and reliable method for enhancing the photoluminescence (PL) of multilayer MoS₂ is demonstrated using an oxygen plasma treatment process followed by laser exposure. Here, the plasma and laser treatments result in an indirect-to-direct band gap transition. The oxygen plasma creates a slight decoupling of the layers and converts some of the MoS₂ to MoO₃. Subsequent laser irradiation further oxidizes the MoS₂ to MoO₃, as confirmed via X-ray photoelectron spectroscopy, and results in localized regions of brightly luminescent MoS₂ monolayer triangular islands as seen in high-resolution transmission electron microscopy images. The PL lifetimes are found to decrease from 494 to 190 ps after plasma and laser treatment, refl

SUBMITTER: Wang B 

PROVIDER: S-EPMC7439701 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature