Graphene Transport at High Carrier Densities using a Polymer Electrolyte Gate

Details Graphene Transport at High Carrier Densities using a Polymer Electrolyte Gate Graphene Transport at High Carrier Densities using a Polymer Electrolyte Gate

2010-09-17

arxiv.org/abs/1009.3367v2

EPL (Europhysics Letters), 92, 27001, (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 4 figures, Published Version

Scientific paper

10.1209/0295-5075/92/27001

We report the study of graphene devices in Hall-bar geometry, gated with a polymer electrolyte. High densities of 6 $\times 10^{13}/cm^{2}$ are consistently reached, significantly higher than with conventional back-gating. The mobility follows an inverse dependence on density, which can be correlated to a dominant scattering from weak scatterers. Furthermore, our measurements show a Bloch-Gr\"uneisen regime until 100 K (at 6.2 $\times10^{13}/cm^{2}$), consistent with an increase of the density. Ubiquitous in our experiments is a small upturn in resistivity around 3 $\times10^{13}/cm^{2}$, whose origin is discussed. We identify two potential causes for the upturn: the renormalization of Fermi velocity and an electrochemically-enhanced scattering rate.

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