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CdS thin films were prepared by chemical bath deposition (CBD) technique. The bath solution is a mixture of Cadmium carbonate CdCO₃ and thioureaas source of Cadmium and Sulfur respectively, ammonia was used as complexing agent. In order to investigate the deposition time; films were prepared with two deposition times 45 and 90 min X-raydiffraction, UV visible spectrophotometry and Fourier transform infrared techniques are used to investigate CdS thin films and the different steps of reactions leading to CdS product. Hexagonal CdS thin films were obtained with (002) preferred orientation and having crystallite size average in the range of 14.3–30.4 nmfor the two deposition times. CdS thin films transmittance is above 70% in visible region. Band gap energy was 2.46 and 2.42 eV for both samples. Studies of different solutions and steps leading to the formation of CdS products were carried. The formation …