The results obtained by investigating the surface morphology and optical properties of thin CdS films formed on transparent glass and glass/indium-tin oxide (ITO) substrates via the chemical and electrochemical methods are presented. Thin cadmium sulfide films are employed as optical windows in thin-film polycrystalline solar cells. Closely packed cadmium sulfide nanoparticles are observed on the conducting oxide (ITO) surface by means of atomic-force microscopy. Large particles (150-300 nm) comprise smaller particles with sizes of 20-30 nm. Thin CdS layers are characterized by a relatively high level of transmission (~60%) in the long-wavelength spectral region (520-600 nm).
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