Ga vacancies in electron irradiated GaN: Introduction, stability and temperature dependence of positron trapping

Research output: Contribution to journalArticle


  • K. Saarinen
  • T. Suski
  • I. Grzegory
  • D. C. Look

Research units


We have applied positron annihilation spectroscopy to show that 2 MeV electron irradiation at 300 K creates Ga vacancies in GaN with an introduction rate of 1 cm-1. The Ga vacancies recover in long-range migration processes at 500-600 K with an estimated migration energy of 1.5(2)eV. Since the native Ga vacancies in as-grown GaN are stable up to 1300-1500 K, we conclude that they are complexes with oxygen impurities. The estimated binding energy of 2.2(4) eV of such complexes is in good agreement with the results of theoretical calculations.


Original languageEnglish
Pages (from-to)77-80
Number of pages4
JournalPhysica B: Condensed Matter
Publication statusPublished - 1 Dec 2001
MoE publication typeA1 Journal article-refereed

    Research areas

  • Ga vacancy, GaN, Irradiation, Positron annihilation

ID: 33474091