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

Mobility variations in mono- and multi-layer graphene films