Mobility variations in mono- and multi-layer graphene films

Details Mobility variations in mono- and multi-layer graphene films Mobility variations in mono- and multi-layer graphene films

2008-12-11

arxiv.org/abs/0812.2107v1

Physics

Condensed Matter

Materials Science

4 pages

Scientific paper

10.1143/APEX.2.025003

The electric properties of mono- and multi-layer graphene films were systematically studied with the layer number determined by their optical contrast. The current modulation increased monotonically with a decrease in the layer number due to the reduction of the interlayer scattering. Carrier mobility in the monolayer was significantly greater than that in the multilayer due to linear dispersion relation. On the other hand, in the monolayer, carrier transport was extremely sensitive to charged impurity density due to the reduction in screening effect, which causes larger mobility variation. Reduction of the charged impurity density is thus key for high mobility.

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