The Optical and Structural Properties of CdS Nano particles Prepared By Spray Pyrolysis Technique

Abstract

Thin films of CdS have been prepared on glass substrates by the chemical spray pyrolysis method at 250oC from solutions including different concentrations of Na2S (0.2 g and 0.4 g). The films were examined using SEM, an X-ray spectrometer, and a UV-Visible spectrometer. The SEM images and X-ray spectrum show that the films were amorphous, and the grain size varied with Na2S concentration. The optical properties and optical constants also varied clearly with Na2S concentration; in addition, the energy gap changed from 2.3 eV to 2.4 eV for both films.