Conference Papers

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Subject: search.filters.subject.Spray pyrolysis

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    Investigations on electrical properties of the CdxZn 1-xS thin films prepared by spray pyrolysis technique
    (2011) Raviprakash, Y.; Bangera, K.V.; Shivakumar, G.K.
    Thin films of CdxZn(1-x)S (0≤x≤1) were deposited on glass substrates by the chemical spray pyrolysis technique. The electrical properties of these films in relation with composition were studied in detail. The entire investigation was made for a wide range of compositions of CdxZn(1-x)S thin films (x=0 to 1 in steps of 0.1). The variations of conductivity and current-voltage characteristics of these films were investigated as a function of the temperature and applied voltage. The activation energy of the films was found to vary from 0.35 eV to 0.78 eV. © 2011 American Institute of Physics.
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    X-ray diffraction studies of CdxZn1-xS thin films prepared by spray pyrolysis technique
    (2013) Raviprakash, Y.; Bangera, K.V.; Shivakumar, G.K.
    Thin films of CdxZn(1-x)S (0 ≤ x ≤ 1) were deposited on glass substrates by the chemical spray pyrolysis technique using a less used combination of chemicals. The variation of structural properties of these films in relation with composition was studied in detail. The entire study was made for a wide range of compositions of CdxZn (1-x) S thin films (x=0 to 1 in steps of 0.1). XRD studies reveal that all the films are polycrystalline with hexagonal (wurtzite) structure of which reflection peaks associated with (100), (002) and (110) planes were clearly identified for all the films and inclusion of cadmium into the structure of ZnS improved the crystallinity of the films. The value of lattice constants 'a' and 'c' was found to vary with composition from 0.382 to 0.415 nm and 0.625 to 0.675 nm respectively. © (2013) Trans Tech Publications, Switzerland.
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    Effect of substrate temperature on the structural and electrical properties of spray deposited lead sulfide thin films
    (Elsevier Ltd, 2016) Veena, E.; Bangera, K.V.; Shivakumar, G.K.
    Lead sulfide (PbS) thin films were prepared by chemical spray pyrolysis method using lead acetate and thiourea as precursors of Pb+2 and S-2 ions. X-ray diffraction (XRD) technique, scanning electron microscope (SEM) and EDAX analysis were used for structural, morphological and compositional characterization. XRD analysis shows that the films are cubic in nature with a preferred orientation along (2 0 0). EDAX analysis shows that films deposited at 150°C are sulfur rich. An increase in the substrate temperature results in a decrease in the sulfur content of the prepared film. It has been observed that thin films deposited at or above 225°C are smooth & uniform morphologically. Beyond a substrate temperature of 275°C, the films become discontinuous and non-uniform. However, the films are sulfur rich, even at 275°C. Electrical conductivity of prepared thin films have been measured using silver contacts in coplanar geometry. Films are n - type as confirmed by hot probe technique. The electrical conductivity at room temperature (25°C) was in the order of 10-4 Ω-1cm-1 and was found to increase with increase in temperature showing the semiconducting nature of the films with the band gap of 0.39 eV. © 2016 Elsevier Ltd.