Sökning: id:"swepub:oai:DiVA.org:ltu-5439" >
Early SiO2 precipit...
Early SiO2 precipitates in Si : vacancy-oxygen versus interstitial-oxygen clusters
-
- Torres, V.J.B. (författare)
- Department of Physics, University of Aveiro, Campus Santiago
-
- Coutinho, J. (författare)
- Department of Physics, University of Aveiro, Campus Santiago
-
- Jones, R. (författare)
- School of Physics, University of Exeter
-
visa fler...
-
- Barroso, M. (författare)
- Department of Physics, University of Aveiro, Campus Santiago
-
- Öberg, Sven (författare)
- Luleå tekniska universitet,Matematiska vetenskaper
-
- Briddon, P.R. (författare)
- School of Natural Science, University of Newcastle upon Tyne
-
visa färre...
-
(creator_code:org_t)
- Elsevier BV, 2006
- 2006
- Engelska.
-
Ingår i: Physica. B, Condensed matter. - : Elsevier BV. - 0921-4526 .- 1873-2135. ; 376-377:1, s. 109-112
- Relaterad länk:
-
https://urn.kb.se/re...
-
visa fler...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- Oxygen precipitation in Si strongly depends on the undergoing thermal treatment. Between 350 and 450 °C thermal donor formation is activated by a 1.4-1.6 eV barrier. On the other hand, at T>500°C, SiO2 cluster formation is limited by the interstitial oxygen (Oi) migration barrier of ∼2.5eV. Volumetric arguments imply that the formation of silica precipitates during anneals of oxygen-rich Si crystals, must be accompanied by the ejection of approximately one Si self-interstitial (Sii) per SiO 2 unit that is formed. We report on ab-initio density-functional studies of small oxygen aggregates in Si, to show that the On→VOn+Sii reaction is exothermic for n≥4. The large energy barrier required to form an intermediate Sii defect prevents the formation of VOn complexes at temperatures as low as 450 °C. Our results imply that thermal donors are not thermodynamically stable clusters, and their formation is driven by kinetics. Infra-red absorption studies can discriminate VOn and On defects. We report their local vibrational modes and compare them with the available experimental data
Ämnesord
- NATURVETENSKAP -- Matematik -- Beräkningsmatematik (hsv//swe)
- NATURAL SCIENCES -- Mathematics -- Computational Mathematics (hsv//eng)
Nyckelord
- Scientific Computing
- Teknisk-vetenskapliga beräkningar
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas