Charge-density depinning at metal contacts of graphene field-effect transistors

Details Charge-density depinning at metal contacts of graphene field-effect transistors Charge-density depinning at metal contacts of graphene field-effect transistors

2010-03-17

arxiv.org/abs/1003.3284v3

Appl. Phys. Lett. 96, 253503 (2010)

Physics

Condensed Matter

Materials Science

To be published in Appl. Phys. Lett

Scientific paper

10.1063/1.3456383

An anomalous distortion is often observed in the transfer characteristics of graphene field-effect transistors. We fabricate graphene transistors with ferromagnetic metal electrodes, which reproducibly display distorted transfer characteristics, and show that the distortion is caused by metal-graphene contacts with no charge-density pinning effect. The pinning effect, where the gate voltage cannot tune the charge density of graphene at the metal electrodes, has been experimentally observed; however, a pinning-free interface is achieved with easily-oxidizable metals. The distortion should be a serious problem for flexible electronic devices with graphene.

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