Microstructural parameters and optical constants of CdS thin films synthesized with various bath temperature

► The optical constants of cadmium sulfide thin films for different bath temperature were determined. ► The crystallite size and microstrain was calculated using Williamson-Hall method. ► The optical band gap values of the films varied from 2.2 to 2.6 eV depending on the bath temperatures. ► The microstrain decreases with increasing film thickness. ► The conductivity and the crystallite size increases up to 70 degrees and then starts decreasing when temperature is still increased due to the change in phase from hexagonal to cubic.