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J. Phys.: Condens. Matter (2012) 125801
Optical spectroscopy study of damage induced in 4H-SiC by swift heavy ion irradiation
S. Sorieul1, J.-M. Costantini2, L. Gosmain3, G. Calas4, C. Trautmann4, X. Kerbiriou2

Single crystals of 4H-SiC were irradiated with swift heavy ions (332 MeV Ti, 106 MeV Pb and 2.7 GeV U) in the electronic energy loss regime. The resulting damage was investigated with UV-visible optical absorption spectroscopy and micro-Raman spectroscopy. The evolution of the Raman data with fluence shows an accumulation of isolated point defects without amorphization of the material and a partial recrystallization of the structure, but only at the lowest fluence. Furthermore, the longitudinal optical phonon-plasmon coupling mode disappears upon irradiation, suggesting a strong perturbation of the electronic structure. This evolution is consistent with the optical bandgap decrease and the Urbach edge broadening that was also previously observed for the irradiation with 4 MeV Au ions.
1 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
2 :  SRMA - Service des Recherches Métallurgiques Appliquées
3 :  SEMI - Service d'Etudes des Matériaux Irradiés
4 :  IMPMC - Institut de minéralogie et de physique des milieux condensés
Planète et Univers/Sciences de la Terre/Minéralogie