Abstract
The structure, morphology and particle size of La-doped ZnS nanocrystalline films were investigated by XRD, SEM and FTIR. XRD showed that the obtained films are nanocrystalline corresponding to the hexagonal ZnS phase with the particle size 3.44–15.13 nm. Optical properties of La-doped ZnS nanocrystalline films were investigated by UV–vis absorption technique. The band gap energy of nanocrystalline films was found to be 2.93 to 2.77 eV. Wemple – Didomenico single effective oscillator model was used to study the dispersion of nanocrystalline films refractive index. The red shift in the absorption band edge of the La-doped ZnS samples provides possibility for improving the solar energy application of ZnS.
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