4.6 Article

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

期刊

APPLIED PHYSICS LETTERS
卷 96, 期 25, 页码 -

出版社

AMER INST PHYSICS
DOI: 10.1063/1.3456383

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electrodes; ferromagnetic materials; field effect transistors; graphene; oxidation

资金

  1. Foundation Advanced Technology Institute
  2. Grants-in-Aid for Scientific Research [19051001] Funding Source: KAKEN

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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. (C) 2010 American Institute of Physics. [doi:10.1063/1.3456383]

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