Nitrogen vacancies as major point defects in gallium nitride

M. G. Ganchenkova*, Risto Nieminen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

117 Citations (Scopus)
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We present results of ab initio calculations for vacancies and divacancies in GaN. Particular attention is paid to nitrogen vacancies and mixed Ga-N divacancies in negatively charged states, which in n-type GaN are found to be energetically comparable with gallium vacancies. We also demonstrate that the activation energy for self-diffusion over the nitrogen sublattice is lower than over the gallium one for all Fermi-level positions, which implies the nitrogen vacancies are major defects in samples annealed at high temperatures. Possibilities for direct observations of nitrogen vacancies through positron annihilation experiments are discussed.
Original languageEnglish
Article number196402
Pages (from-to)1-4
JournalPhysical Review Letters
Issue number19
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed


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