Tuning the graphene work function by electric field effect

Details Tuning the graphene work function by electric field effect Tuning the graphene work function by electric field effect

2009-08-31

arxiv.org/abs/0909.0020v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages and 8 figures including supplementary information, to appear in Nano Letters

Scientific paper

We report variation of the work function for single and bi-layer graphene devices measured by scanning Kelvin probe microscopy (SKPM). Using the electric field effect, the work function of graphene can be adjusted as the gate voltage tunes the Fermi level across the charge neutrality point. Upon biasing the device, the surface potential map obtained by SKPM provides a reliable way to measure the contact resistance of individual electrodes contacting graphene.

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