Abstract

. Its appearance was only observed in samples grown on a MgO or heavily aluminum-doped ZnO buffer layer. The properties of the recombination mechanism were probed by photoluminescenceand photoluminescence-excitation spectroscopy. The recombination was classified to be an exciton bound to aneutral donor. Both an ionized state and a two-electron satellite transition were observed and could be corre-lated with the central transition. The excitation channels are similar to those of the well-known I

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