Observation of biexcitonic emission at extremely low power density in tungsten disulfide atomic layers grown on hexagonal boron nitride.

ABSTRACT: Monolayer transition metal dichalcogenides (TMDCs) including WS₂, MoS₂, WSe₂ and WS₂, are two-dimensional semiconductors with direct bandgap, providing an excellent field for exploration of many-body effects in 2-dimensions (2D) through optical measurements. To fully explore the physics of TMDCs, the prerequisite is preparation of high-quality samples to observe their intrinsic properties. For this purpose, we have focused on high-quality samples, WS₂ grown by chemical vapor deposition method with hexagonal boron nitride as substrates. We observed sharp exciton emissions, whose linewidth is typically 22~23 meV, in photoluminescence spectra at room temperature, which result clearly demonstrates the high-quality of the current samples. W

SUBMITTER: Okada M 

PROVIDER: S-EPMC5428332 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature