Direct observations of the vacancy and its annealing in germanium

J. Slotte, S. Kilpeläinen, F. Tuomisto, J. Räisänen, A. Nylansted Larsen

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Weakly n-type doped germanium has been irradiated with protons up to a fluence of 3×1014 cm−2 at 35 K and 100 K in a unique experimental setup. Positron annihilation measurements show a defect lifetime component of 272±4 ps at 35 K in in situ positron lifetime measurements after irradiation at 100 K. This is identified as the positron lifetime in a germanium monovacancy. Annealing experiments in the temperature interval 35–300 K reveal two annealing stages. The first at 100 K is tentatively associated with the annealing of the Frenkel pair, the second at 200 K with the annealing of the monovacancy. Above 200 K it is observed that mobile neutral monovacancies form divacancies, with a positron lifetime of 315 ps.
Original languageEnglish
Article number235212
Pages (from-to)1-5
Number of pages5
JournalPhysical Review B
Issue number23
Publication statusPublished - Jun 2011
MoE publication typeA1 Journal article-refereed


  • divacancy
  • germanium
  • monovacancy
  • positron


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