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Crystals 2013, 3(1), 1-13; doi:10.3390/cryst3010001
Article

Is the Registry Between Adjacent Graphene Layers Grown on C-Face SiC Different Compared to That on Si-Face SiC

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1 Department of Physics, Chemistry and Biology, Linköping University, Linköping 58183, Sweden 2 MAX-lab, Lund University, Lund 22100, Sweden
* Author to whom correspondence should be addressed.
Received: 16 November 2012 / Revised: 17 December 2012 / Accepted: 9 January 2013 / Published: 15 January 2013
(This article belongs to the Special Issue Graphenes)
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Abstract

Graphene grown on C-face SiC substrates using two procedures, high and low growth temperature and different ambients, was investigated using Low Energy Electron Microscopy (LEEM), X-ray Photo Electron Electron Microscopy (XPEEM), selected area Low Energy Electron Diffraction (μ-LEED) and selected area Photo Electron Spectroscopy (μ-PES). Both types of samples showed formation of μm-sized grains of graphene. The sharp (1 × 1) μ-LEED pattern and six Dirac cones observed in constant energy photoelectron angular distribution patterns from a grain showed that adjacent layers are not rotated relative to each other, but that adjacent grains in general have different azimuthal orientations. Diffraction spots from the SiC substrate appeared in μ-LEED patterns collected at higher energies, showing that the rotation angle between graphene and SiC varied. C 1s spectra collected did not show any hint of a carbon interface layer. A hydrogen treatment applied was found to have a detrimental effect on the graphene quality for both types of samples, since the graphene domain/grain size was drastically reduced. From hydrogen treated samples, μ-LEED showed at first a clear (1 × 1) pattern, but within minutes, a pattern containing strong superstructure spots, indicating the presence of twisted graphene layers. The LEED electron beam was found to induce local desorption of hydrogen. Heating a hydrogenated C-face graphene sample did not restore the quality of the original as-grown sample.
Keywords: C-face graphene; layer registry; large grain sizes; sublimation growth; hydrogen treatment C-face graphene; layer registry; large grain sizes; sublimation growth; hydrogen treatment
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Johansson, L.I.; Xia, C.; Hassan, J.U.; Iakimov, T.; Zakharov, A.A.; Watcharinyanon, S.; Yakimova, R.; Janzén, E.; Virojanadara, C. Is the Registry Between Adjacent Graphene Layers Grown on C-Face SiC Different Compared to That on Si-Face SiC. Crystals 2013, 3, 1-13.

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