Lookup NU author(s): Dr Jose Coutinho,
Professor Patrick Briddon
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Three experiments appear to cast doubt on self-interstitial-free models of the family of thermal donors, based on oxygen defects of increasing size. These are (a) the rapid transformation of TDD(N) into TDD(N+1) with activation energies considerably lower than that of oxygen diffusion, (b) the lack of any appreciable spin-density on oxygen in TDD(N)+, and (c) the observation of only two oxygen related vibrational modes associated with each donor. However, we show that the oxygen-only model of the donors is compatible with experiment for a structure involving an insulating core with normal oxygen coordination, surrounded by over-coordinated oxygen atoms which are responsible for the donor activity. It is also shown that the calculated stress-energy tensors for the early donors are in good agreement with the measurements. © 2001 Elsevier Science B.V. All rights reserved.
Author(s): Jones R, Coutinho J, Oberg S, Briddon PR
Publication type: Article
Publication status: Published
Journal: Physica B: Condensed Matter
ISSN (print): 0921-4526
ISSN (electronic): 1873-2135
Notes: International Conference on Defects in Semiconductors
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