Optical and transport phenomena in CdO:La films prepared by sol-gel method |
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Authors: | A A Dakhel A Y Ali-Mohamed |
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Institution: | (1) Department of Physics, College of Science, University of Bahrain, P.O. Box 32038, Isa Town, Kingdom of Bahrain;(2) Department of Chemistry, College of Science, University of Bahrain, P.O. Box 32038, Isa Town, Kingdom of Bahrain |
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Abstract: | A series of lightly La-doped CdO thin films (1%, 5%, and 7%) have been prepared by a spin coater sol-gel technique on amorphous
glass and crystalline Si substrates. Those prepared films were studied by X-ray diffraction (XRD), UV-VIS-NIR absorption spectroscopy,
and dc-electrical measurements. The investigation shows that La doping grows slightly the CdO lattice parameter and decreases
the intrinsic energygap from 2.1 eV to 1.7 eV. The optical properties were easily explained in the framework of classical
Drude theory and thus all the corresponding parameters were determined. The electrical behaviour of the samples shows that
they are degenerate semiconductors until the atomic percentage of the La dopant was 7% then the sample was converted into
a non-degenerate semiconductor. Generally, it was observed that the conductivity and mobility of the carriers were decreased
by increasing the La content in the CdO film samples. |
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Keywords: | Optical properties Lanthanum– cadmium oxide La-doped Cd Mobility Oxides Sol-gel Degenerate semiconductors |
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