Silicon nitride gate dielectrics and bandgap engineering in graphene layers

Details Silicon nitride gate dielectrics and bandgap engineering in graphene layers Silicon nitride gate dielectrics and bandgap engineering in graphene layers

2010-09-10

arxiv.org/abs/1009.2023v1

Nano Letters, Vol.10, p.3572 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We show that silicon nitride can provide uniform coverage of graphene in field-effect transistors while preserving the channel mobility. This insulator allowed us to study the maximum channel resistance at the Dirac (neutrality) point as a function of the strength of a perpendicular electric field in top-gated devices with different numbers of graphene layers. Using a simple model to account for surface potential variations (electron-hole puddles) near the Dirac point we estimate the field-induced band-gap or band-overlap in the different layers.

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