Room-Temperature Photoluminescence Mediated by Sulfur Vacancies in 2D Molybdenum Disulfide.

ABSTRACT: Atomic defects in monolayer transition metal dichalcogenides (TMDs) such as chalcogen vacancies significantly affect their properties. In this work, we provide a reproducible and facile strategy to rationally induce chalcogen vacancies in monolayer MoS₂ by annealing at 600 °C in an argon/hydrogen (95%/5%) atmosphere. Synchrotron X-ray photoelectron spectroscopy shows that a Mo 3d_5/2 core peak at 230.1 eV emerges in the annealed MoS₂ associated with nonstoichiometric MoS_x (0 < x < 2), and Raman spectroscopy shows an enhancement of the ∼380 cm^-1 peak that is attributed to sulfur vacancies. At sulfur vacancy densities of ∼1.8 × 10¹⁴ cm^-2, we observe a defect peak at ∼1.72 eV (referred to as LX_D

SUBMITTER: Zhu Y 

PROVIDER: S-EPMC10373523 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature