Carrier Density and Electric Field Dependent Nonlinear Transport of Chemical Vapor Deposition Graphene
KHALIL Hafiz M. W., KELEKCI Ozgur, NOH Hwayong**
Department of Physics and Graphene Research Institute, Sejong University, Seoul 143-747, Korea
Abstract ：We report on the measurements of nonlinear current-voltage characteristics of graphene fabricated by chemical vapor deposition. The current-voltage characteristic is described by a power law with a superlinear dependence of the current on the voltage, and the nonlinearity depends on the carrier density and the excitation level. The nonlinearity is strongest at the Dirac point and becomes weaker as the carrier density increases. At the Dirac point, we also observe a crossover to a much stronger nonlinear transport when the electric field increases above 104 V/m.
收稿日期: 2012-08-15
出版日期: 2013-03-29
:
72.80.Vp
(Electronic transport in graphene)
72.20.Ht
(High-field and nonlinear effects)
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2013, Vol. 30 
