First-principles study of migration, restructuring, and dissociation energies of oxygen complexes in silicon

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© 2002 American Physical Society (APS). This is the accepted version of the following article: Lee, Young Joo & von Boehm, J. & Pesola, M. & Nieminen, Risto M. 2002. First-principles study of migration, restructuring, and dissociation energies of oxygen complexes in silicon. Physical Review B. Volume 65, Issue 8. 085205/1-12. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.65.085205, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.65.085205.
Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2002
Major/Subject
Mcode
Degree programme
Language
en
Pages
085205/1-12
Series
Physical Review B, Volume 65, Issue 8
Abstract
Migration, restructuring, and dissociation energies of oxygen complexes in silicon are studied theoretically through density-functional total-energy calculations. We find that the stablest oxygen complexes are straight chains that also have the lowest migration energies. The calculated migration energies decrease from 2.3 eV for an interstitial oxygen atom (Oi) to low values of 0.4–1.6 eV for O2–O9 chains and 1.9–2.2 eV for longer chains. The oxygen chains (which are thermal double donors) are expected to grow so that the migrating oxygen chains capture less-mobile but abundant Oi’s: On+Oi→On+1. Restructuring energies of chains with a side Oi into straight oxygen chains are 1.9–2.5 eV. Restructuring gives an essential contribution to the fast diffusion. We find that the shorter O2–O9 chains dissociate primarily by ejecting one of the outermost oxygen atoms.
Description
Keywords
silicon, oxygen complexes
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Citation
Lee, Young Joo & von Boehm, J. & Pesola, M. & Nieminen, Risto M. 2002. First-principles study of migration, restructuring, and dissociation energies of oxygen complexes in silicon. Physical Review B. Volume 65, Issue 8. 085205/1-12. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.65.085205.