Raman scattering spectra in C-implanted GaN epilayers

Abstract

We have investigated the Raman scattering spectra in C-implanted GaN epilayers. (a) In as-implanted GaN, new Raman bands at 293, 376, 669, 1027, 1094 and 1053 cm-1 appeared. From phonon-dispersion curves for hexagonal GaN, the 293 cm-1 and 669 cm-1 bands were tentatively assigned to the highest acoustic-phonon branch and the optical-phonon branch at the Brillouin zone boundaries, respectively; the 1027 and 1094 cm-1 peaks might be caused by two-phonon scattering involving the 376 and 669 cm -1 phonons, and the 376 cm-1 and AI(LO) phonons respectively. (b) Two sharp bands at ∼1350 and ∼1600 cm-1 were observed in the Raman spectra of carbon-implanted GaN after post-implantation annealing treatments. The intensities of these two bands increased while their full widths at half maximum decreased with increasing annealing temperature. We assigned them, respectively, to the D and G bands of small graphite crystallites arising from C implantation and post-implantation annealing. The observation of these two bands indicates the formation of small graphite crystallites in C-implanted GaN. © 2001 Materials Research Society.