The calculated electronic and optical properties of β-Ga2O3 based on the first principles

Introduction The electronic and optical properties of beta-Ga2O3 have been investigated by CASTEP using first principles. It is found that beta-Ga2O3 has an indirect band gap and the conduction band base is located at the Gamma point. The stability of beta-Ga2O3 is demonstrated by the calculation of elastic constants, and the ductility of beta-Ga2O3 is demonstrated by the ratio of Poisson's ratio to shear modulus. The optical property analysis shows that beta-Ga2O3 has a high absorption capacity in the ultraviolet region, but a low absorption capacity in visible and infrared light. Context The structure, optical, and electronic properties of beta-Ga2O3 are calculated and analyzed based on first-principles calculation. The optimized structures of beta-Ga2O3 are in good agreement with previously studied. In this paper, the elastic, electronic, and optical properties of beta-Ga2O3 are calculated. Methods The CASTEP code was employed to execute these calculations in the present work, where the exchange-correlation interactions were treated in the generalized gradient approximation (GGA) using the Perdew-Burke-Ernzerhof (PBE) functional in the geometry optimizations and electronic and elastic properties.