STUDY OF STRUCTURAL AND OPTICAL PROPERTIES OF Cd1-xCoxS THIN FILMS PREPARED BY THERMAL EVAPORATION METHOD

摘要

Thin films of cobalt doped cadmium sulfide with 50 nm thickness and different cobalt concentrations were deposited on glass substrates by thermal evaporation method. The structure of the films was investigated by X-ray diffractometry (XRD). It was revealed that the films have hexagonal structure with (002) preferred orientation. Transmittance and absorption spectra of the films were measured at wavelength range 250-1100 nm. Then the band gap and refractive index of the films were calculated by using transmittance and absorption spectra. The results indicated reduction of the band gap with increase in cobalt concentration.