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1.0 μm, and the content of cadmium x in the CdxPb1−xS solid solution varies from 0.036 to 0.090. All the CdxPb1−xS films have B1 crystal structure (NaCl type), but differ in the morphology (the size, form and predominant orientation of the particles forming the films). Forming the substitution solid solution is confirmed by the shift of the Raman lines at 72 and 134 cm⁻¹ toward higher frequencies. The optical band gap determined from the absorption spectra varies from 0.46 to 0.70 eV. The dependences of the photoresponse value (volt-watt sensitivity) and the dark resistance on cadmium acetate concentration in the solution are represented.

(22–53) nm before and after heat treatment, respectively. Optical studies reveal the direct bandgap value of 2.42 eV for the heat-treated ED-CdS and CBD-CdS layers which correspond to the bulk bandgap of CdS (hexagonal phase). Morphological studies depict the average grain sizes in the range

(90–260) nm for the CdS thin-films. The PEC cell measurements show that the CdS layers grown by both ED and CBD methods were n-type in electrical conduction before and after heat treatment. No visible precipitations of elemental S or CdS particles were observed in the deposition electrolyte of ED-CdS showing a stable bath using TU precursor during the growth. The solar cells fabricated using CBD-CdS showed better performance as compared to the devices fabricated using ED-CdS due to the uniform coverage of FTO surface and better fill factor (FF).

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