| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Raman Spectrum of Epitaxial Graphene on SiC (0001) by Pulsed Electron Irradiation |
HUANG Qing-Song, GUO Li-Wei, WANG Wen-Jun, WANG Gang, WANG Wan-Yan, JIA Yu-Ping, LIN Jing -Jing, LI Kang, CHEN Xiao-Long |
| Beijing National Laboratory for Condensed Matter Physics,Institute of Physics, Chinese Academy of Sciences, PO Box 603, Beijing100190 |
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| Cite this article: |
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HUANG Qing-Song, GUO Li-Wei, WANG Wen-Jun et al 2010 Chin. Phys. Lett. 27 046803 |
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Abstract We report new Raman features of epitaxial graphene (EG) on Si-face 4H-SiC prepared by pulsed electron irradiation (PEI). With increasing graphene layers, frequencies of G and 2D peaks show blue-shifts and approach those of bulk highly-oriented pyrolytic graphite. It is indicated that the EG is slightly tension strained and tends to be strain-free. Meanwhile, single Lorentzian line shapes are well fitted to the 2D peaks of EG on SiC(0001) and their full widths at half maximum decrease with the increasing graphene layers, which indicates that the multilayer EG on Si-face can also contain turbostratic stacking by our PEI route instead of only AB Bernal stacking by a traditional thermal annealing method. It is worth noting that the stacking style plays an important role on the charge carrier mobility. Therefore our findings will be a candidate for growing quality graphene with high carrier mobility both on the Si- and C-terminated SiC substrate. Mechanisms behind the features are studied and discussed.
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| Keywords:
68.65.Pq
74.25.Nd
61.48.Gh
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Received: 21 January 2010
Published: 27 March 2010
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