Size Dependent Structural and Optical Properties of Cd0.9Zn0.1S Thin Films

The chemical bath deposition (CBD) method has become very popular in recent years, especially for the thin film deposition, because it has less expensive than other thin film deposition methods which allows for the manufacture of relatively low cost devices. Cd0.9Zn0.1S thin films have been deposited on galass substrate with different deposition times from 30 min to 90 min by chemical bath deposition method. The optical and structural properties are investigated for different deposition times to get better insight into the microstructure of the material. The average grain size of the films is increased from 204 to 347 Å with increase in deposition time. The micro strain of the films is measured from XRD studies. The absorption of the films is increased and shifts the absorption peak to lower wavelength sides with deposition time. The energy gap of the films is increased with deposition times as observed in grain size. The micro strain, band gap and absorption enhancement with deposition time are due to the grain size enhancement with deposition time.