A stochastic nonlinear electrical characteristic of graphene is reported. Abrupt current changes are observed from voltage sweeps between the source and drain with an on/off ratio up to 103. It is found that graphene channel experiences the topological change. Active radicals in an uneven graphene channel cause local changes of electrostatic potential. Simulation results based on the self-trapped electron and hole mechanism account well for the experimental data. Our findings illustrate an important issue of reliable electron transports and help for the understanding of transport properties in graphene devices.

Topics
Electronic transport, Transport properties, Electrical properties and parameters, Electrostatics, Plasma processing, Graphene, Metal oxides, Chemical elements, Electrochemical reactions, Stochastic processes
© 2013 American Institute of Physics.
2013
American Institute of Physics
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