Gallium nitride has been irradiated to two fluences with energetic Au2+ ions at 300 K. Two different damage levels and depth profiles were produced that are characterized by near-surface damage accumulation and deeper-regime damage saturation. Thermal annealing at 873 K resulted in disorder recovery only in the near-surface region at low fluence. However, simultaneous irradiation with 5.4 MeV Si2+ ions during annealing at 873 K induced significant recovery over the entire damage profile at both low and high fluences. The irradiation-enhanced recovery is primarily attributed to defect-stimulated recovery and epitaxial recrystallization processes due to the creation of mobile Frenkel pairs.
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Jiang et al. (2003) studied this question.
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