LAUSR

Abstract This study explores the electronic and optical properties of WS 2 monolayer using first-principle calculations based on density functional theory. Results show that WS 2 monolayer demonstrates large absorption coefficient and photoconductivity and high refraction index in the visible light range. Generally, the optical properties of WS 2 monolayer are considerably similar to those of MoS 2 , although approximately 0.2 eV ultraviolet-shift has been found in the visible light range. This result indicates that WS 2 monolayer can also be extensively used as an efficient optical material similar to MoS 2 monolayer. The mechanism of the optical properties is explored using the density of state and the partial density of state.