Abstract
Transition metal dichalcogenides (TMDs) have drawn immense interest recently owing to their exotic electronic and optoelectronic properties. We report here our work on highly pure WS2 crystal which was cleaved under ultra-high vacuum (UHV) conditions and was investigated by in-situ low energy electron diffraction (LEED), scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) measurements. LEED and STM measurements clearly indicate atomic configuration of the surface and the hexagonal arrangement of the WS2 crystal, whereas, STS measurements reveal the local electronic structure of the surface via tunneling of electrons through conduction and valence bands. From the STS studies performed on WS2 surface at different points, we estimate the band gap which is around 2.0 eV.
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