Thermally stable carbon-related centers in 6H-SiC: Photoluminescence spectra and microscopic models
- Theoretische Festkoerperphysik, Universitaet Erlangen-Nuernberg, Staudtstrasse 7, D-91058 Erlangen (Germany)
Recent ab initio calculations [Mattausch et al., Phys. Rev. B 70, 235211 (2004)] of carbon clusters in SiC reveal a possible connection between the tricarbon antisite (C{sub 3}){sub Si} and the U photoluminescence center in 6H-SiC [Evans et al., Phys. Rev. B 66, 35204 (2002)]. Yet, some of the predicted vibrational modes were not observed experimentally. We report experiments that, indeed, confirm the existence of a low-energy mode for the U center (as well as for the HT3 and HT4 centers with spectral details similar to the U center). We calculated the isotope splitting for the (C{sub 3}){sub Si}-defect and found near-perfect agreement with our data. In addition, we discuss the carbon di-interstitial (C{sub 2}){sub Hex} as a model for the Z and HT5 centers. The isotope splitting is also well reproduced, but the absolute values of the local mode energies show a discrepancy of about 10 meV.
- OSTI ID:
- 20788074
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 73, Issue 16; Other Information: DOI: 10.1103/PhysRevB.73.161201; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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