Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-11-10
Solid State Commun 149, 1068-1071 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1016/j.ssc.2009.02.039
There is an increasing amount of literature concerning electronic properties of graphene close to the neutrality point. Many experiments continue using the two-probe geometry or invasive contacts or do not control samples' macroscopic homogeneity. We believe that it is helpful to point out some problems related to such measurements. By using experimental examples, we illustrate that the charge inhomogeneity induced by spurious chemical doping or metal contacts can lead to large systematic errors in assessing graphene's transport properties and, in particular, its minimal conductivity. The problems are most severe in the case of two-probe measurements where the contact resistance is found to strongly vary as a function of gate voltage.
Blake Peter
Geim Andre K.
Grigorieva I. V.
Morozov Sergey V.
Novoselov Kostya S.
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