Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-10-14
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12 pages, 3 figures
Scientific paper
The intrinsic doping level of graphene prepared by mechanical exfoliation and standard lithography procedures on thermally oxidized silicon varies significantly and seems to depend strongly on processing details and the substrate morphology. Moreover, transport properties of such graphene devices suffer from hysteretic behavior under ambient conditions. The hysteresis presumably originates from dipolar adsorbates on the substrate or graphene surface. Here, we demonstrate that it is possible to reliably obtain low intrinsic doping levels and to strongly suppress hysteretic behavior even in ambient air by depositing graphene on top of a thin, hydrophobic self assembled layer of hexamethyldisilazane (HMDS). The HMDS serves as a reproducible template that prevents the adsorption of dipolar substances. It may also screen the influence of substrate deficiencies.
Klauk Hagen
Klitzing Klaus von
Krauss Benjamin
Lafkioti Myrsini
Lohmann Timm
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