A Comparison between the Electrical and Optical Properties of CdS: in Thin Films for Two Doping Ratios

Indium-doped cadmium sulphide cds:in thin films were prepared by the spray pyrolysis (sp) technique on glass substrates at a substrate temperature ts = 490°c. a comparison between the electrical and optical properties of the films for two different doping ratios was made through measuring and analyzing the transmittance curves, photoluminescence spectra (pl) and i-v plots. it was found that the higher doping ratio results in a decrease in the transmittance and pl signal, and a slight increase in the optical bandgap energy. also it results in a considerable reduction of the resistvity of the films. so choosing the proper doping ratio is important to produce high quality cds:in thin films suitable for the use as windows in cds/cdte solar cells.