biostudies-literatureYe JSwiss National Science Foundation13002-6https://www.ebi.ac.uk/biostudies/studies/S-EPMC3156196biostudies-literatureUnknown108(32)We present a comparative study of high carrier density transport in mono-, bi-, and trilayer graphene using electric double-layer transistors to continuously tune the carrier density up to values exceeding 10(14) cm(-2). Whereas in monolayer the conductivity saturates, in bi- and trilayer filling of the higher-energy bands is observed to cause a nonmonotonic behavior of the conductivity and a large increase in the quantum capacitance. These systematic trends not only show how the intrinsic high-density transport properties of graphene can be accessed by field effect, but also demonstrate the robustness of ion-gated graphene, which is crucial for possible future applications.Proceedings of the National Academy of Sciences of the United States of AmericaAccessing the transport properties of graphene and its multilayers at high carrier density.PMC3156196200021121569Koshino MInoue SCraciun MFShimotani HYuan HMorpurgo AFIwasa YYe JRusso SfalseAccessing the transport properties of graphene and its multilayers at high carrier density.We present a comparative study of high carrier density transport in mono-, bi-, and trilayer graphene using electric double-layer transistors to continuously tune the carrier density up to values exceeding 10(14) cm(-2). Whereas in monolayer the conductivity saturates, in bi- and trilayer filling of the higher-energy bands is observed to cause a nonmonotonic behavior of the conductivity and a large increase in the quantum capacitance. These systematic trends not only show how the intrinsic high-density transport properties of graphene can be accessed by field effect, but also demonstrate the robustness of ion-gated graphene, which is crucial for possible future applications.2011-01-01T00:00:00Z2011 Aug2021-02-20T19:08:09Z2019-03-27T03:07:58ZS-EPMC31561962182800710.1073/pnas.1018388108