Powder heat-treated in NH3 atmosphere was investigated by electron paramagnetic resonance, photoluminescence, and Raman spectroscopy. It was found that the treatment created Zn interstitials (Zni) and complexes of Zn interstitials and N atoms replacing oxygen (Zni-NO). A correlation between the Zni and an exciton at 3.366eV (I3) could be shown by comparison with the photoluminescence results. The (Zni-NO) complex seemed to be related to a recombination at 3.193eV.

Zn Interstitial Related Donors in Ammonia-Treated ZnO Powders. J.Sann, J.Stehr, A.Hofstaetter, D.M.Hofmann, A.Neumann, M.Lerch, U.Haboeck, A.Hoffmann, C.Thomsen: Physical Review B, 2007, 76[19], 195203 (6pp)