Frequency Dependant Conduction in Thermally Evaporated Cds Thin Films

Thin films of Cadmium Sulphide (CdS) and the sandwich structures of CdS in Ag electrodes (Ag/CdS/Ag) are prepared by thermal evaporation technique at different substrate temperatures. Investigations on the frequency dependant di-electric properties of the film as a function of the substrate temperature of deposition are carried out. The investigation reveals that there is hopping type of conduction in the CdS film. The nature of variation of A.C. conductivity agrees well with correlated barrier-hopping (CBH) model. The dielectric and impedance spectra indicate multi-relaxation behavior in the sample.