STRUCTURAL AND OPTICAL-PROPERTIES OF ELECTRODEPOSITED BI2S3, SB2S3 AND AS2S3 THIN-FILMS

Thin films of Bi2S3, Sb2S3 and As2S3 have been prepared by the electrodeposition technique from aqueous acidic baths using Na2S2O3 as a sulphide source. The films deposited from an EDTA-complexed bath are thin, uniform and adherent to the substrate. The electrodeposition potentials were estimated by polarization curves. The structural and optical properties of the films have been studied. The X-ray diffraction pattern of the films shows that they are polycrystalline. The estimated optical bandgap energies for Bi2S3, Sb2S3 and As2S3 are 1.58 eV, 1.74 eV and 2.35 eV respectively.