Effects of reaction temperature on the physical properties of chemically deposited Cds films

Cadmium sulfide films were grown by the chemical bath deposition technique using CdCl₂, CS(NH₂)₂, KOH, NH₄/NH₄OH and sodium citrate as the reactive substances. CdS films were deposited by one hour at solution temperatures from 30°C to 80°C. The structural and optical properties of the films were studied as a function of the reaction temperature. There is found that homogeneous, transparent with good adherence CdS films can be obtained in the whole range of deposition temperature. The main effect of temperature is to increase the deposition rate of the films. The energy band gap of the CdS films is not affected significatively by the reaction temperature. The high value for the energy band gap of the films is expained in terms of the contraction of the CdS crystalline lattice.