Optical properties of ZnS and effect of doping with transition elements

By the help of density functional theory for a Cu doped ZnS compound the charge density, Fermi surface and electronic structure have been examined. We have used (FP-LAPW) method, to deal with interchange relationship potential for solving of kohn-sham equations. We apply generalized gradient approximation (GGA), local density approximation (LDA) and Engel-Vosko GGA (EVGGA). Cu doped ZnS compound confirms that nature of material is metallic and Fermi energy (EF) is obtained by the overlapping of Cu-p and Zn- d state. At Fermi energy (EF) calculated density of states is 51.932, 18.655 and 13.235 states/ev, and low-temperature electronic specific heat co-efficient (γ) is found to be 9.008mJ/mol-K2 for GGA, 3.236mJ/mol-K2 for LDA, and it was 2.295mJ/mol-K2 for EVGGA respectively. The thermal properties and optical constant were also discussed and calculated.