Divacancies at room temperature in germanium

  • Slotte J
  • Kuitunen K
  • Kilpeläinen S
 et al. 
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Abstract

We have studied the annealing of vacancy defects in neutron and proton irradiated germanium. After neutron irradiation the Sb-doped samples were annealed at 473, 673 and 773 K for 30 min. The positron lifetime was measured as a function of temperature (30 - 295 K). A lifetime component of 330 ps with no temperature dependence is observed in as irradiated samples, identified as the positron lifetime in a neutral divacancy. The average positron lifetime in the samples annealed at 473 K has a definite temperature dependence, suggesting that the divacancies become negative as the crystal recovers and the Fermi level moves upward in the band gap. Proton irradiation of germanium at 37 K with subsequent room temperature annealing also resulted in a similar lifetime component 315 ps, in good agreement with the neutron irradiation experiment. © 2009 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Divacancy
  • Germanium
  • Point defect
  • Positron annihilation spectroscopy

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Authors

  • J. Slotte

  • K. Kuitunen

  • S. Kilpeläinen

  • F. Tuomisto

  • I. Capan

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