Nano-Objects Developing at Graphene/Silicon Carbide Interface

Details Nano-Objects Developing at Graphene/Silicon Carbide Interface Nano-Objects Developing at Graphene/Silicon Carbide Interface

2009-11-11

arxiv.org/abs/0911.2143v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 5 figures

Scientific paper

We use scanning tunneling microscopy and spectroscopy to study epitaxial graphene grown on a C-face 4H-SiC(000-1) substrate. The results reveal amazing nano-objects at the graphene/SiC interface leading to electronic interface states. Their height profiles suggest that these objects are made of packed carbon nanotubes confined vertically and forming mesas at the SiC surface. We also find nano-cracks covered by the graphene layer that, surprisingly, is not broken, with no electronic interface state. Therefore, unlike the above nano-objects, these cracks should not affect the carrier mobility.

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