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

Thin films of Bi2S3, Sb2S3 and As2S3 have been prepared by the electro deposition technique from aqueous acidic baths using Na2S2O3 as a sulp hide source. The films deposited from an EDTA-complexed bath are thin, uniform and adherent to the substrate. The electrodeposition potentia ls were estimated by polarization curves. The structural and optical p roperties of the films have been studied. The X-ray diffraction patter n of the films shows that they are polycrystalline. The estimated opti cal bandgap energies for Bi2S3, Sb2S3 and As2S3 are 1.58 eV, 1.74 eV a nd 2.35 eV respectively.