Transmission electron microscopy investigations of epitaxial graphene on C-terminated 4H-SiC

Transmission electron microscopy (TEM) investigations of epitaxial graphene, grown on on-axis and 8° off-axis C-terminated 4H-SiC ( 000 1 ¯ ) surfaces are presented. The TEM results provide evidence that the first carbon layer is separated by 3.2 Å from the C-terminated SiC surface. It was also foun...

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Published in:Journal of applied physics 2010-07, Vol.108 (1), p.013518-013518-6
Main Authors: Borysiuk, J., Bożek, R., Grodecki, K., Wysmołek, A., Strupiński, W., Stępniewski, R., Baranowski, J. M.
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creator Borysiuk, J.
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description Transmission electron microscopy (TEM) investigations of epitaxial graphene, grown on on-axis and 8° off-axis C-terminated 4H-SiC ( 000 1 ¯ ) surfaces are presented. The TEM results provide evidence that the first carbon layer is separated by 3.2 Å from the C-terminated SiC surface. It was also found that thick graphene layers grown on on-axis SiC ( 000 1 ¯ ) are loosely bound to the SiC substrate. Moreover, the structural observations reveal a certain degree of disorder between the graphene planes, which manifests itself in a rotation of the layers and in an increase in the interplanar spacing between certain carbon layers from 3.35 Å, which is characteristic for graphite, up to 3.7 Å. Graphene grown on 8° off-axis SiC ( 000 1 ¯ ) substrates covers the steps of SiC and as a result disorder seems to be not as pronounced as it is on the on-axis SiC ( 000 1 ¯ ) substrate.
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title Transmission electron microscopy investigations of epitaxial graphene on C-terminated 4H-SiC
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