Mechanisms of doping graphene

Details Mechanisms of doping graphene Mechanisms of doping graphene

2010-03-02

arxiv.org/abs/1003.0624v1

Physics

Condensed Matter

Materials Science

submitted to Physica Status Solidi

Scientific paper

We distinguish three mechanisms of doping graphene. Density functional theory is used to show that electronegative molecule like F4-TCNQ and electropositive metals like K dope graphene p- and n-type respectively. These dopants are expected to lead to a decrease in carrier mobility arising from Coulomb scattering but without any hysteresis effects. Secondly, a novel doping mechanism is exhibited by Au which dopes bilayer graphene but not single layer. Thirdly, electrochemical doping is effected by redox reactions and can result in p-doping by humid atmospheres and n-doping by NH3 and toluene.

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