Electronic and optical properties of beryllium carbide monolayer: First principles calculations

New quasi-planar hexacoordinate structure for Be2C monolayer is studied by the first principles calculations in the framework of the density functional theory. The obtained cohesive energy present a good structural stability for this compound. A direct band gap exist in Γ direction about 1.65 eV, so a semiconducting character is obtained. Optical interband transitions are investigated and described by joint density of states. The optical studies exhibit a transparent character for this compound by 2.5% reflectivity in the visible range of light. The obtained results suggest this material for nano-electronic devices and applications.