Enhancing and quantifying spatial homogeneity in monolayer WS₂.

ABSTRACT: Controlling the radiative properties of monolayer transition metal dichalcogenides is key to the development of atomically thin optoelectronic devices applicable to a wide range of industries. A common problem for exfoliated materials is the inherent disorder causing spatially varying nonradiative losses and therefore inhomogeneity. Here we demonstrate a five-fold reduction in the spatial inhomogeneity in monolayer WS₂, resulting in enhanced overall photoluminescence emission and quality of WS₂ flakes, by using an ambient-compatible laser illumination process. We propose a method to quantify spatial uniformity using statistics of spectral photoluminescence mapping. Analysis of the dynamic spectral changes shows that the enhancement is due to a spatially sensitive redu

SUBMITTER: Cao Y 

PROVIDER: S-EPMC8295334 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature