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

Ryo Nouchi, Katsumi Tanigaki

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)


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.

Original languageEnglish
Article number253503
JournalApplied Physics Letters
Issue number25
Publication statusPublished - 2010 Jun 21

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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