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.
@article{arxiv.1003.0624,
title = {Mechanisms of doping graphene},
author = {H. Pinto and R. Jones and J. P. Goss and P. R. Briddon},
journal= {arXiv preprint arXiv:1003.0624},
year = {2015}
}