Hydrogen-related 3.8 eV UV luminescence in α-Ga2O3

D. Nicol, Y. Oshima, J. W. Roberts, L. Penman, D. Cameron, P. R. Chalker, R. W. Martin, F. C.-P. Massabuau

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Temperature-dependent photoluminescence was used to investigate the impact of H on the optical properties of α-Ga2O3 films grown by halide vapor phase epitaxy. An additional UV luminescence line centered at 3.8 eV is observed at low temperatures, which strongly correlates with the concentration of H in the films. This luminescence line is assigned to donor–acceptor pair recombination involving an H-related shallow donor and H-decorated Ga vacancy (VGa-nH) as the acceptor, where n = 1, 2, 3. Previous reports have already suggested the impact of H on the electrical properties of Ga2O3, and the present study shows its clear impact on the optical properties of α-Ga2O3.
Original languageEnglish
Article number062102
Number of pages6
JournalApplied Physics Letters
Issue number6
Publication statusPublished - 7 Feb 2023


  • photoluminescence
  • α-Ga2O3 films
  • Gallium oxide
  • plasma


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