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Co-doped ZnO: synthesis and structural, electrical and optical properties

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Abstract

This paper reports the synthesis, crystal structure and electrical conductivity properties of Co-doped ZnO powders (in the range of 0.25–15 mol%). I-phase samples, which were indexed as single phase with a hexagonal (wurtzite) structure in the Co-doped ZnO system, were determined by X-ray diffraction. The solubility limit of Co ions in the ZnO structure was found to be 15 mol% at after heating at 950 °C. The impurity phase was determined to be Co3O4 at lower temperatures than 950 °C. The research focused on single I-phase samples which were synthesized at 950 °C. For I-phase samples (after heating at 950 °C), the lattice parameters a and c decreased with increasing Co concentration. Electrical conductivity of undoped ZnO and 15 mol% Co-doped ZnO (after heating at 950 °C) were found to be 7.8*10−7 and 1.05*10−4 Ω−1 cm−1, respectively, at 25 °C and 1.15 and 37.15 Ω−1 cm−1, respectively, at 950 °C. Thus, it appears that electrical conductivity slightly increases with Co doping. Also, activation energy of the all I-phase samples (after heating at 950 °C) was calculated and the values were found to be range from 0.774 to 1.201 eV. UV/vis absorption spectras of undoped and the all I-phase samples (after heating at 950 °C) were recorded and optical band gap values were found to be between 3.351 and 3.416 eV.

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Acknowledgments

This study was financially supported by the Research Foundation of Erciyes University (Kayseri, Turkey).

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Çankırı Karatekin University, 18100, Çankırı, Turkey

    Hakan Çolak

  2. Department of Chemistry, Faculty of Science, Erciyes University, 38039, Kayseri, Turkey

    Orhan Türkoğlu

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  1. Hakan Çolak
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Correspondence to Hakan Çolak.

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Çolak, H., Türkoğlu, O. Co-doped ZnO: synthesis and structural, electrical and optical properties. J Mater Sci: Mater Electron 26, 10141–10150 (2015). https://doi.org/10.1007/s10854-015-3700-1

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  • DOI: https://doi.org/10.1007/s10854-015-3700-1

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