Graphene Layers on Silicon Carbide Studied by Raman Spectroscopy


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We present a micro-Raman spectroscopy study on single- and few layer graphene (FLG) grown on the silicon terminated surface of 6H-silicon carbide (SiC). On the basis of the 2D-line (light scattering from two phonons close to the K-point in the Brillouin zone) we distinguish graphene mono- from bilayers or few layer graphene. Monolayers have a 2D-line consisting of only one component, whereas more than one component is observed for thicker graphene layers. Compared to the graphite the monolayer graphene lines are shifted to higher frequencies. We tentatively ascribe the corresponding phonon hardening to strain in the first graphene layer.



Materials Science Forum (Volumes 600-603)

Edited by:

Akira Suzuki, Hajime Okumura, Prof. Tsunenobu Kimoto, Takashi Fuyuki, Kenji Fukuda and Dr. Shin-ichi Nishizawa




J. Röhrl et al., "Graphene Layers on Silicon Carbide Studied by Raman Spectroscopy ", Materials Science Forum, Vols. 600-603, pp. 567-570, 2009

Online since:

September 2008