Abstract
Zinc oxide thin films were prepared by thermal oxidation of zinc films at a temperature of 500°C for 2 h. The Zn films were deposited onto glass substrates by magnetron RF sputtering. The sputtering time varied from 2.5 min to 15 min. The physico-chemical characterization of the ZnO films was carried out depending on the Zn sputtering time. According to x-ray diffraction, ZnO films were polycrystalline and the Zn-ZnO phase transformation was direct. The mean transmittance of the ZnO films was around 80% and the band gap increased from 3.15 eV to 3.35 eV. Photoluminescence spectra show ultraviolet, visible, and infrared emission bands. The increase of the UV emission band was correlated with the improvement of the crystalline quality of the ZnO films. The concentration of native defects was found to decrease with increasing Zn sputtering time. The decrease of the electrical resistivity as a function of Zn sputtering time was linked to extrinsic hydrogen-related defects.
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Acknowledgements
The authors gratefully acknowledge one of them, G. Schmerber, for the valuable discussions and for the structural and morphological characterization. Thanks are due to G. Ferblantier and D. Muller, from ICube in Strasbourg (France) for their help during the optical measurements.
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Bouanane, I., Kabir, A., Boulainine, D. et al. Characterization of ZnO Thin Films Prepared by Thermal Oxidation of Zn. J. Electron. Mater. 45, 3307–3313 (2016). https://doi.org/10.1007/s11664-016-4469-6
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DOI: https://doi.org/10.1007/s11664-016-4469-6