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EPR and theoretical studies of positively charged carbon vacancy in 4H-SiC
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2004 (English)Article in journal (Refereed) Published
Abstract [en]

The carbon vacancy is a dominant defect in 4H-SiC, and the "E15" electron-paramagnetic-resonance (EPR) spectrum originates from positively charged carbon vacancies (VC+) at quasicubic sites. The observed state for EI5, however, has been attributed to a motional-averaged state with the C3v symmetry, and its true atomic structure has not been revealed so far. We here report low temperature (<40 K) EPR measurements on EI5 and show that this center has a C1h-symmetric structure due to Jahn-Teller distortion. We also performed ab inito calculations of the hyperfine tensors for EI5, and obtained a good agreement between experiment and theory in not only their principal values but also their principal axis directions. A good agreement was also demonstrated for the EI6 center (hexagonal-site VC+) in this paper. The transition from EI5(C1h) to EI5(C3v) was found to be thermally activated and its activation energy was measured as 0.014 eV.

Place, publisher, year, edition, pages
2004. Vol. 70, no 23
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-41122DOI: 10.1103/PhysRevB.70.235212Local ID: 55225OAI: oai:DiVA.org:liu-41122DiVA: diva2:261972
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2011-01-12

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Nguyen, Son TienJanzén, Erik

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