Abstract
Structural, morphological, optical and electrical properties of magnesium (Mg) doped zinc oxide (ZnO) films prepared by ultrasonic spray pyrolysis technique on microscope glass substrate, have been studied in terms of Mg doping content. The precursors solutions of Mg doped ZnO films were prepared from zinc acetate dihydrate (Zn (CH3OO)2⋅2H2O) and magnesium acetate tetrahydrate (CH3COO)2Mg⋅4H2O) acted as dopant. The compositions of these solutions were fixed at 0.02 M of Zn (CH3OO)2.2H2O and the atomic percentage ratio of Mg/Zn was varied from 0 to 20 atomic %. The XRD pattern of all films showed ZnO hexagonal wurtzite structure and the morphology showed homogeneous structure/texture and pinhole-free with adding Mg content. It was found that Mg2+ ions do not change conductivity of ZnO films due to the partial substitution of Zn2+ ion by the same valence Mg2+ ion. For optical properties, all films showed high transmittance over 80% and absorbance about 0.01 in visible and near infrared regions. Moreover, the Mg dopant affects on a shift of the absorption edge in transmittance spectra of the films to a lower wavelength in ultraviolet region and increases the band gap of the samples.
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