Structural and Optical Properties of In2S3 Nano Layers Grown by Close Spaced Evaporation.

Nanocrystalline In2S3 films have been prepared by close spaced evaporation technique. The films were grown on coring 7059 glass substrates at different temperatures in the range, 200–350 °C. The structural and surface morphological studies were analyzed by using X-ray diffractometer, scanning electron microscope and atomic force microscope. The optical characteristics of the films were evaluated from the optical transmittance data. All the films showed a strong (103) peak at 2Θ∼14.2°, which correspond to tetragonal structure of β-In2S3 and the surface roughness increased with the increase of substrate temperature. The material parameters such as lattice strain and texture coefficient were also determined and the influence of substrate temperature on these parameters was discussed. The optical band gap was found to be direct and the layers grown at 300 °C had a band gap of 2.46 eV. [ABSTRACT FROM AUTHOR]