Abstract
CdS films were prepared by a chemical bath deposition technique with different Bi concentrations (0.01 to 5 wt %) on glass substrates. Optical and electrical properties were studied with these films. It was observed that the absorption coefficient of the CdS film increases with Bi-doping up to 2 wt % and then decreases. These results are explained in terms of the crystallanity of the film. The optical band gaps (E g) were determined and found to decrease with Bi-doping. The conductivity and thermoelectric power are higher for doped films than undoped CdS films. These results are explained by considering the existance of Cd 2+ ions as donor centres in Bi-doped CdS films.
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