Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 25, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3456383
Keywords
electrodes; ferromagnetic materials; field effect transistors; graphene; oxidation
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Funding
- Foundation Advanced Technology Institute
- 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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