EPR and theoretical studies of positively charged carbon vacancy in 4H-SiC
- Umeda T.
- Isoya J.
- Morishita N.
- Ohshima T.
- Kamiya T.
- Gali A.
- Deák P.
- Son N. T.
- Janzén E.
- 梅田 享英
DOIAbstract
The carbon vacancy is a dominant defect in 4H-SiC, and the "EI5" 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 de...
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