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Structural, Morphological, Optical and Electrical Properties of Spray Deposited Ternary CdZns Thin Films |
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PP: 17-24 |
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Author(s) |
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V. Narasimman,
V. S. Nagarethinam,
K. Usharani,
A. R. Balu,
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Abstract |
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| Nanostructured ternary CdZnS thin films with zinc concentrations (0, 2, 4, 6 and 8 wt.%) were prepared by spray pyrolysis technique using perfume atomizer on glass substrates at 400° C. The effect of Zn doping on the structural morphological, optical and electrical properties of the films was studied. All the films exhibit hexagonal structure with a preferential orientation along the (0 0 2) plane irrespective of the Zn doping level. SEM analysis showed that the film morphology modifies from clustered grains to nanosized needle shaped grains with Zn doping. Film transparency increases with Zn doping and the film coated with 6 wt.% Zn concentration exhibit a maximum transmittance of nearly 90% in the visible region. Optical band gap was blue shifted with increase in Zn doping which is associated with Moss-Burstein (MB) effect. PL and Raman spectra implied that more defects existed in the doped samples. All the films have resistivity in the order of 101 Ω-m and the CdS film coated with 6 wt.% Zn concentration had a minimum resistivity of 0.675 x 101 Ω-m. |
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