ZnO powder heat treated in NH₃ atmosphere was investigated by electron paramagnetic resonance, photoluminescence, and Raman spectroscopy. We find that the treatment creates Zn interstitials (Znᵢ) and complexes of Zn interstitials and nitrogen atoms substituting oxygen (Znᵢ-NO). A correlation between the Znᵢ and an exciton at 3.3660.3em0exeV (I₃) can be stated by a comparison with the PL results; furthermore, the (Znᵢ-NO) complex seems to be related to a recombination at 3.1930.3em0exeV.
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Sann et al. (2007) studied this question.
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