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Direct observations of the vacancy and its annealing in germanium
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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5
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Physical Review B, Volume 83, issue 23, pp. 1-5
Abstract
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.
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Slotte, J, Kilpeläinen, S, Tuomisto, F, Räisänen, J & Nylansted Larsen, A 2011, 'Direct observations of the vacancy and its annealing in germanium', Physical Review B, vol. 83, no. 23, 235212, pp. 1-5. https://doi.org/10.1103/PhysRevB.83.235212