Abstract
The temperature dependence of free and bound exciton lines in high-purity, undoped wurtzite GaN layers has been studied by photoluminescence (PL) between 2 and 300 K. Below 30 K the neutral donor bound exciton D °X produces the strongest near band gap PL signal whereas free A and B excitons dominate the spectrum at room temperature. A deconvolution of the asymmetric D °X line shape provides strong evidence for two residual shallow donors differing in ionisation energies by a factor of 1.5. The origin of a PL line occurring at E g = 116 meV is discussed in two alternative models.
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