Structural, Morphological And Optical Properties Of Nanocrystalline PbTe100-XSex Thin Films

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Kungumadevi L Sathyamoorthy R

Abstract

Nanocrystalline PbTe100-xSex thin films are prepared using an integrated physical-chemical approach by evaporating chemically synthesized PbTe100-xSex nanopowders on glass substrates. All the deposited films exhibiting the face centered cubic structure with the crystallite orientation along (200) direction. The crystallite size of the films is within the range 10 - 26 nm. XRD analysis indicated that the lattice constants of PbTe100- xSex thin films decreased with the increasing amount of Se. Raman spectra of these PbTe100- xSex thin films show a wavelength shift in the peak position as compared with PbTe due to the addition of Se in PbTe. The observed optical band gap energy in nanocrystalline PbTe100- xSex films is much larger than the bulk value of 0.32 eV due to quantum confinement effect

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