Abstract
Films of bismuth telluride (Bi2Te3) and its selenium (Se) derivatives (Bi2SeTe2, Bi2Se2Te, Bi2Se3) were deposited using electrodeposition on indium tin oxide coated glass substrate (ITO). The structural, morphological and optical properties of the prepared films were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), raman spectroscopy and UV-Visible spectroscopy. Nanostructured polycrystalline films with rhombohedral crystal structure were obtained. Substitution of Se in place of Te does not induce any structural transition but changes the lattice parameters systematically with Se content. However, a new Raman band is observed around 235 cm-1 for intermediate compositions while the end members exhibit only E2g band. Wavelength selective optical transmission proportional to selenium concentration is observed in UV-Vis spectroscopy studies.
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