Recently, the efficient preparation techniques of zinc sulfide (ZnS) nanostructured films have drawn great attention due to their potential applications in optoelectronics. In this study, the low-cost and high-yield chemical bath deposition (CBD) technique was used to deposit ZnS nanostructured thin films. The effect of various deposition parameters such as time, pH, precursor concentration, and temperature on the morphology and energy bandgap (Eg) of the prepared thin films were investigated. The characterization of the prepared thin films revealed the formation of polycrystalline ZnS with Narcissus-like nanostructures. Moreover, the optical characterization showed inverse proportionality between both the transmission and Eg of the nanostructured thin films and the variation of the deposition parameters. A range of different Eg values between 3.92 eV with 20% transmission and 4.06 eV with 80% transmission was obtained. Tuning the Eg values and transmission of the prepared nanostructured films by manipulating the deposition parameters of such an efficient technique could lead to applications in optoelectronics such as solar cells and detectors.

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The chemical bath deposition technique (CBD) had used for depositing Cu2S thin films on the glass substrates. It found that thickness and deposition rate were significantly dependent on deposition parameters (deposition time and pH value). XRD data indicates that at different deposition times and pH values are given amorphous structure except for the deposited thin film of (8hours) and, pH of (10.4) the structure was crystalline. The morphology of the deposited thin films remarkably changed as the deposition time increased. Optical transmittance measurements illustrate that transmission of the thin films decreases from 93.27% for a deposition time of 4 hours to 81.73 for deposition time of 10 hours and, the maximum transmission rate of the films is 95.21 % with pH=8.4 and decreases to 28.39 % with pH=11.4. Also, optical studies revealed that Cu2S thin film with direct energy bandgap decreased from 3.04 to 2.78 eV as deposition time increased and from 3.09 to 2.32 eV as pH increased.