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Evaluation of vacancy-type defects in ZnO by the positron annihilation lifetime spectroscopy

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Abstract

Thermal behavior of vacancy-type defects in polycrystalline ZnO was studied by the positron annihilation lifetime spectroscopy. Two-component analysis of the PALS spectra revealed that the defect-related longer-lifetime component decreases as the annealing temperature is raised, and almost disappears within 15 min when annealed at 1,273 K. We also found that the intensity of this component decreases with increasing density of the annealed ZnO pellets; however, little density dependence was seen in its lifetime. These observations evidently suggest that this component having long lifetime of about 400 ps corresponds to the positrons trapped in grain boundaries in the polycrystalline ZnO.

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Acknowledgments

This work was supported in part by JSPS KAKENHI Grant Number 23600004.

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Authors and Affiliations

  1. Institute of Science and Engineering, Kanazawa University, Kakumamachi, Kanazawa, Ishikawa, 920-1192, Japan

    W. Sato

  2. Graduate School of Natural Science and Technology, Kanazawa University, Kakumamachi, Kanazawa, Ishikawa, 920-1192, Japan

    R. Ono & T. Togimitsu

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  1. R. Ono
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  2. T. Togimitsu
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  3. W. Sato
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Correspondence to W. Sato.

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Ono, R., Togimitsu, T. & Sato, W. Evaluation of vacancy-type defects in ZnO by the positron annihilation lifetime spectroscopy. J Radioanal Nucl Chem 303, 1223–1226 (2015). https://doi.org/10.1007/s10967-014-3452-z

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  • DOI: https://doi.org/10.1007/s10967-014-3452-z

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