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Cited by 936

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Interaction, growth, and ordering of epitaxial graphene on SiC{0001} surfaces: A comparative photoelectron spectroscopy study

Emtsev, K. V., Speck, F., Seyller, Th., Ley, L., Riley, J. D.·2008·Physical Review B

Abstract

Thermally induced growth of graphene on the two polar surfaces of $6H\text{\ensuremath{-}}\mathrm{Si}\mathrm{C}$ is investigated with emphasis on the initial stages of growth and interface structure. The experimental methods employed are angle-resolved valence band photoelectron spectroscopy, soft x-ray induced core-level spectroscopy, and low-energy electron diffraction. On the Si-terminated (0001) surface, the $(6\sqrt{3}\ifmmode\times\else\texttimes\fi{}6\sqrt{3})R30\ifmmode^\circ\else\textdegree\fi{}$ reconstruction is the precursor of the growth of graphene and it persists at the interface upon the growth of few layer graphene (FLG). The $(6\sqrt{3}\ifmmode\times\else\texttimes\fi{}6\sqrt{3})R30\ifmmode^\circ\else\textdegree\fi{}$ structure is a carbon layer with graphene-like atomic arrangement covalently bonded to the substrate where it is responsible for the azimuthal ordering of FLG on SiC(0001). In contrast, the interaction between graphene and the C-terminated $(000\overline{1})$ surface is much weaker, which accounts for the low degree of order of FLG on this surface. A model for the growth of FLG on SiC{0001} is developed, wherein each new graphene layer is formed at the bottom of the existing stack rather than on its top. This model yields, in conjunction with the differences in the interfacial bonding strength, a natural explanation for the different degrees of azimuthal order observed for FLG on the two surfaces.

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Metadata

Authors
Emtsev, K. V., Speck, F., Seyller, T., Ley, L., & Riley, J. D.
Venue
Physical Review B
Published
2008-04-02
Volume
77
Issue
15
ISSN
  • 1098-0121 (ISSN-L)
  • 1550-235X
OpenAlex
W2062757334
Cited by
936
References
31
FWCI
32.84
Type
journal article
Language
en
Open access
closed

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Emtsev, K. V., Speck, F., Seyller, T., Ley, L., & Riley, J. D. (2008). Interaction, growth, and ordering of epitaxial graphene on SiC{0001} surfaces: A comparative photoelectron spectroscopy study. Physical Review B. https://doi.org/10.1103/physrevb.77.155303

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