Electronic properties of vacancy-oxygen complexes in SiGe alloys

V. P. Markevich, A. R. Peaker, L. I. Murin, J. Coutinho, V. J.B. Torres, R. Jones, S. Öberg, P. R. Briddon, F. D. Auret, N. V. Abrosimov

Research output: Contribution to journalConference articlepeer-review


Capacitance transient techniques, combined with ab initio modeling, were employed to study the electronic properties and structure of vacancy-oxygen (VO) complexes in unstrained Czochralski-grown Si1-xGex crystals (0<x≤0.06). At least three configurations of the VO center in SiGe alloys have been identified. The most stable configuration consists of a Si-O-Si unit and a Ge-Si reconstructed bond in a vacancy. This configuration is about 0.2 eV more stable than separated VO and Ge defects and possesses an acceptor level which is about 25 meV deeper compared to the level of the VO center without a Ge atom in a nearest-neighbor site. Two configurations with a Ge atom in the second nearest-neighbor shell around an off-center oxygen atom have been found to be stable. One of these configurations has an acceptor level, which is about 15 meV shallower than that for the VO complexes with more remote Ge atoms.

Original languageEnglish
Pages (from-to)790-794
Number of pages5
JournalPhysica B: Condensed Matter
Publication statusPublished - 31 Dec 2003
EventProceedings of the 22nd International Conference on Defects in (ICDS-22) - Aarhus, Denmark
Duration: 28 Jul 20031 Aug 2003


  • Electronic properties
  • SiGe
  • Structure
  • Vacancy-oxygen complexes


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