Journal
NANO LETTERS
Volume 10, Issue 5, Pages 1559-1562Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl9035302
Keywords
Graphene; conductivity; four probe; SiC; anisotropy
Categories
Funding
- Office of Naval Research
- NRL's Nanoscience Institute
- National Research Council
- American Society for Engineering Education Naval Research Laboratory
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We present the first microscopic transport study of epitaxial graphene on SiC using an ultrahigh vacuum Four-probe scanning tunneling microscope. Anisotropic conductivity is observed that is caused by the interaction between the graphene and the underlying substrate. These results can be explained by a model where charge buildup at the step edges leads to local scattering of charge carriers. This highlights the importance of considering substrate effects in proposed devices that utilize nanoscale patterning of graphene on electrically isolated substrates.
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