Double-gated graphene-based devices

Details Double-gated graphene-based devices Double-gated graphene-based devices

2009-05-08

arxiv.org/abs/0905.1221v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Replaced with revised version. To appear on New Journal of Physics

Scientific paper

We discuss transport through double gated single and few layer graphene devices. This kind of device configuration has been used to investigate the modulation of the energy band structure through the application of an external perpendicular electric field, a unique property of few layer graphene systems. Here we discuss technological details that are important for the fabrication of top gated structures, based on electron-gun evaporation of SiO$_2$. We perform a statistical study that demonstrates how --contrary to expectations-- the breakdown field of electron-gun evaporated thin SiO$_2$ films is comparable to that of thermally grown oxide layers. We find that a high breakdown field can be achieved in evaporated SiO$_2$ only if the oxide deposition is directly followed by the metallization of the top electrodes, without exposure to air of the SiO$_2$ layer.

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