The Effect of Preparation Conditions on Raman and Photoluminescence of Monolayer WS₂.

ABSTRACT: We report on preparation dependent properties observed in monolayer WS₂ samples synthesized via chemical vapor deposition (CVD) on a variety of common substrates (Si/SiO₂, sapphire, fused silica) as well as samples that were transferred from the growth substrate onto a new substrate. The as-grown CVD materials (as-WS₂) exhibit distinctly different optical properties than transferred WS₂ (x-WS₂). In the case of CVD growth on Si/SiO₂, following transfer to fresh Si/SiO₂ there is a ~50 meV shift of the ground state exciton to higher emission energy in both photoluminescence emission and optical reflection. This shift is indicative of a reduction in tensile strain by ~0.25%. Additionally, the excitonic state in x-WS

SUBMITTER: McCreary KM 

PROVIDER: S-EPMC5067492 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature