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Early stage donor-vacancy clusters in germanium

  • José Coutinho
  • Vitor J. B. Torres
  • Sven Öberg
  • Alexandra Carvalho
  • Colin Janke
  • Robert Jones
  • Patrick R. Briddon
Article

Abstract

There is considerable experimental evidence that vacancies in Ge dominate several solid state reactions that range from self-diffusivity to metal and dopant transport. It is therefore vital that we fully understand how vacancies interact with other point defects in Ge. Here we have a look at the properties of small donor-vacancy (Sb n V m with m,n ≤  2) complexes in Ge by ab-initio density functional modeling. Particular attention has been payed to binding energies and to the electronic activity of the complexes. We found that all aggregates may contribute to the np type conversion that is typically observed under prolonged MeV irradiation conditions. In general, Sb n V m defects are double acceptors. It is also suggested that spontaneous formation of Sb3V complexes may limit the activation level of donors introduced by ion implantation.

Keywords

Formation Energy Donor Level Deep Level Transient Spectroscopy Ground State Structure Single Vacancy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors would like to acknowledge INTAS (grant No. 03–50–4529), and the FCT in Portugal for financial support. We also thank the Swedish National Infrastructure for Computing (SNIC) under the Swedish Science Council for computer resources.

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • José Coutinho
    • 1
  • Vitor J. B. Torres
    • 1
  • Sven Öberg
    • 2
  • Alexandra Carvalho
    • 3
  • Colin Janke
    • 3
  • Robert Jones
    • 3
  • Patrick R. Briddon
    • 4
  1. 1.Department of PhysicsUniversity of AveiroAveiroPortugal
  2. 2.Department of MathematicsLuleå University of TechnologyLuleåSweden
  3. 3.School of PhysicsUniversity of ExeterExeterUK
  4. 4.School of Natural SciencesUniversity of Newcastle upon TyneNewcastle upon TyneUK

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