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• W2100479905 endingPage "2689" @default.
• W2100479905 startingPage "2674" @default.
• W2100479905 abstract "Recognition of the ``negative-U'' character of the donor levels of the single vacancy in Si compels one to make a reassessment of the long-range, Coulomb contribution to the Si divacancy binding enthalpy. On the basis of simple models, a revised value of 1.7 eV is obtained, of which 0.8 eV is from Coulomb interaction and 0.9 eV from short-range interaction. This Coulomb attraction serves to explain the previous observation that, below 340 ifmmode^circelsetextdegreefi{}C, divacancies anneal by long-range migration rather than by dissociation to single vacancies. Recent positron-annihilation measurements by Dannefaer et al. are shown to be consistent with this value of the binding enthalpy and with a vacancy-formation enthalpy of 2.4 eV. Some evidence is given that the positron is bound in a single vacancy with only about 1 eV of energy so that detrapping is significant above 900 K. It also seems likely that divacancy diffusion accounts for a significant fraction of Si self-diffusion above 1300 ifmmode^circelsetextdegreefi{}C and for the increase in self-diffusion activation energy from 4 to 5 eV between 1200 and 1400 ifmmode^circelsetextdegreefi{}C." @default.
• W2100479905 created "2016-06-24" @default.
• W2100479905 creator A5080469473 @default.
• W2100479905 date "1986-02-15" @default.
• W2100479905 modified "2023-09-24" @default.
• W2100479905 title "Divacancy binding enthalpy and contribution of divacancies to self-diffusion in Si" @default.
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• W2100479905 doi "https://doi.org/10.1103/physrevb.33.2674" @default.
• W2100479905 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9938608" @default.
• W2100479905 hasPublicationYear "1986" @default.
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