Unexpected positive role of oxygen vacancies in Na-doped ZnO

Unexpected positive role of oxygen vacancies in Na-doped ZnO

The interaction of Na impurities and O vacancies (VO) in ZnO was studied in theory and experiment. The VO facilitated substitutional Na (NaZn/NaZn−) acceptors with inhibiting interstitial Na (Nai/Nai+) donors, which may benefit the p-type conductivity. The formed (NaZn-VO)+/0 complexes induced the c...

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Veröffentlicht in:Journal of applied physics 2012-12, Vol.112 (11)
Hauptverfasser: Yang, X. P., Lu, J. G., Zhang, H. H., Lu, B., Huang, J. Y., Ye, C. L., Ye, Z. Z.
Format: Artikel
Sprache:eng
Schlagworte:
Band structure of solids
Emission
Energy gap
Impurities
Luminescence
Spectral emissivity
Vacancies
Zinc oxide
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Zusammenfassung:The interaction of Na impurities and O vacancies (VO) in ZnO was studied in theory and experiment. The VO facilitated substitutional Na (NaZn/NaZn−) acceptors with inhibiting interstitial Na (Nai/Nai+) donors, which may benefit the p-type conductivity. The formed (NaZn-VO)+/0 complexes induced the change of band structures of ZnO, with the broadening of gap energies and disappearance of the VO2+-related impurity level, which confirmed by the blue shift of the near-band-edge (NBE) UV emission and the decay of the visible emission in PL spectra. The strong and dominant NBE UV emission suggested acceptable luminescence behaviors of Na-doped ZnO.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4768279