PHOTOCONDUCTIVITY STUDIES ON CDS FILMS GROWN BY CHEMCAL BATH DEPOSITION TECHNQUE

CdS films were prepared by chemical bath deposition (CBD) at 60 °C without stirring. The optical properties of the films were seen to be dependent on the film thicknesses. The band gap energy obtained as 2.42 eV from the optical absorption measurements. The activation energy of the dark conductivity found to be 0.45 eV from the resistance measurements. Two different time constants were measured, one for fast decaying component and one for slow decaying component as 7.35 ms and 36.5 ms, for CdS films from the AC photoconductivity data.