Indian Journal of Physics, vol.98, no.3, pp.1103-1107, 2024 (SCI-Expanded, Scopus)
In the present work, we propose an improved method for calculating formation energies, which reduces the self-interaction error of the general gradient approximation and solves the band gap problem. We describe a general comparison of the results obtained with different functionals. We demonstrate that approximation and exchange correlation functions combination used in this work improve the band gap problem of DFT and increase the formation energy of vacancy. The effect of impurity atoms on density of state and formation energy was studied.