A new approach to prepare polycrystalline pbte-Teo thin film, and its optical, structural, surface and electrical characterization


Meydaneri Tezel F. , Afsin Kariper I.

Surface Review and Letters, 2021 (SCI Expanded İndekslerine Giren Dergi) identifier

Özet

© 2021 World Scientific Publishing Company.In this study, PbTe thin film was produced on glass substrates, via chemical bath deposition (CBD) method, with 3-h deposition time at 50C. The produced thin film had polycrystalline structure; TeO2, PbTe, PbTe3 and Te2O5 crystals that were characterized by X-ray diffraction (XRD) had tetragonal, cubic, tetragonal and monoclinic crystal structures, respectively. Reflectivity (R; in %), optical transmission (T; in %), optical bandgap (Eg), absorption, dielectric constant (ϵ), extinction coefficient (k) and refractive index (nr) of polycrystalline PbTe thin film obtained using UV-Vis spectrophotometer were 29.87%, 19.41%, 3.30eV, 0.6, 3.72, 0.05 and 4.08, respectively. Grain sizes of polycrystalline PbTe thin film varied between 8.79nm and 52.55nm. Optical and electrical conductivities of the crystals according to photon energy were calculated using optical parameters, whereas their surface morphology was characterized by scanning electron microscopy (SEM). The thickness of polycrystalline PbTe thin film was measured by atomic force microscopy (AFM), and found to be 900nm.