Observation of donor-acceptor pair spectra in the photoluminescence of H- and Zn-implanted ZnO single crystals

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Donor-acceptor (D-A) pair spectra have been observed in the photoluminescence radiative recombination of selected donor bound exciton complexes in zinc oxide (ZnO) single crystals that have been ion implantation doped with H and Zn atoms and subsequently annealed in a nitrogen (N2) atmosphere at temperatures in the range of 700–800°C. Observations of the D-A pair spectra are explained as the bound states of Hopfield’s bound exciton complex model, in terms of the effective mass approximation of the wurtzitic ZnO energy band structure.