▎ 摘　　要

The contact properties between metal and graphene were examined. The electrical measurement on a multiprobe device with different contact areas revealed that the current flow preferentially entered graphene at the edge of the contact metal. The analysis using the cross-bridge Kelvin (CBK) structure suggested that a transition from the edge conduction to area conduction occurred for a contact length shorter than the transfer length of similar to 1 mu m. The contact resistivity for Ni was measured as similar to 5 x 10(-6) Omega cm(2) using the CBK. A simple calculation suggests that a contact resistivity less than 10(-9) Omega cm(2) is required for miniaturized graphene field effect transistors. (C) 2010 American Institute of Physics. [doi:10.1063/1.3491804]