JOURNAL OF PHYSICS-CONDENSED MATTER, vol.20, no.5, 2008 (SCI-Expanded)
Polycrystalline CdS films have been deposited by ultrasonic spray pyrolysis method. The electrical properties of the sample have been studied by means of an analysis based on the thermally stimulated current (TSC) spectrum at a heating rate of 0.06 K s(-1) in the temperature range of 40-250 K. In order to evaluate the trap parameters of the sample, we have used curve fitting and initial rise methods. The TSC spectrum indicates that the sample has seven overlapped peaks located at levels in the range of 0.021-0.138 eV below the conduction band. The values of the frequency factor, the capture cross section and the concentration of the traps have been determined from the observed peaks in the TSC spectrum of the sample.