Shifting donor-acceptor photoluminescence in N-doped ZnO
Takayuki Makino, A. Tsukazaki, A. Ohtomo, M. Kawasaki, H. Koinuma
Abstract
We have grown nitrogen-doped ZnO films grown by two kinds of epitaxial methods on lattice-matched ScAlMgO4 substrates. We measured the photoluminescence (PL) of the two kinds of ZnO:N layers in the donor-acceptor-pair transition region. The analysis of excitation-intensity dependence of the PL peak shift with a fluctuation model has proven that our observed growth-technique dependence was explained in terms of the inhomogeneity of charged impurity distribution. It was found that the inhomogeneity in the sample prepared with the process showing better electrical property was significantly smaller in spite of the similar nitrogen concentration. The activation energy of acceptor has been evaluated to be ≈ 170 meV, which is independent of the nitrogen concentration.
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