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The contact properties between metal and graphene were examined. Theelectrical measurement on a multiprobe device with different contact areasrevealed that the current flow preferentially entered graphene at the edge ofthe contact metal. The analysis using the cross-bridge Kelvin structure (CBK)suggested that a transition from the edge conduction to area conductionoccurred for a contact length shorter than the transfer length of ~1 micron.The contact resistivity for Ni was measured as ~5*10-6 Ohmcm2 using the CBK. Asimple calculation suggests that a contact resistivity less than 10-9 Ohmcm2 isrequired for miniaturized graphene field effect transistors.

Contact resistivity and current flow path at metal/graphene contact