Map of two-dimensional tungsten chalcogenide compounds (W-S, W-Se, W-Te) based on USPEX evolutionary search

New two-dimensional nanostructures of W–X composition (X = S, Se, Te) are predicted using the evolutionary algorithm implemented in the USPEX software package. Based on the results, two new thermodynamically and dynamically stable two-dimensional W$_3$S$_5$ and W$_5$Te$_2$ structures are proposed. The density functional theory study of the electronic and optical properties of these monolayers is carried out. It is demonstrated that the predicted W$_3$S$_5$ and W$_5$Te$_2$ structures show semiconducting properties with band gaps of 0.62 and 0.40 eV, respectively, and the calculated extinction spectrum indicates a broad absorption band in the visible spectral range, making these materials promising for applications in photovoltaics and solar energy.