Direct observation of charge transfer region at interfaces in graphene devices

Naoka Nagamura; Koji Horiba; Satoshi Toyoda; Shodai Kurosumi; Toshihiro Shinohara; Masaharu Oshima; Hirokazu Fukidome; Maki Suemitsu; Kosuke Nagashio; Akira Toriumi

doi:10.1063/1.4808083

Direct observation of charge transfer region at interfaces in graphene devices

Naoka Nagamura, Koji Horiba, Satoshi Toyoda, Shodai Kurosumi, Toshihiro Shinohara, Masaharu Oshima, Hirokazu Fukidome, Maki Suemitsu, Kosuke Nagashio, Akira Toriumi

Information Devices Division

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Nanoscale spectromicroscopic characterizing technique is indispensable for realization of future high-speed graphene transistors. Highly spatially resolved soft X-ray photoelectron microscopy measurements have been performed using our "3D nano-ESCA" (three-dimensional nanoscale electron spectroscopy for chemical analysis) equipment in order to investigate the local electronic states at interfaces in a graphene device structure. We have succeeded in detecting a charge transfer region at the graphene/metal-electrode interface, which extends over ∼500 nm with the energy difference of 60 meV. Moreover, a nondestructive depth profiling reveals the chemical properties of the graphene/SiO₂-substrate interface.

Original language	English
Article number	241604
Journal	Applied Physics Letters
Volume	102
Issue number	24
DOIs	https://doi.org/10.1063/1.4808083
Publication status	Published - 2013 Jun 17

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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Direct observation of charge transfer region at interfaces in graphene devices. / Nagamura, Naoka; Horiba, Koji; Toyoda, Satoshi; Kurosumi, Shodai; Shinohara, Toshihiro; Oshima, Masaharu; Fukidome, Hirokazu; Suemitsu, Maki; Nagashio, Kosuke; Toriumi, Akira.

In: Applied Physics Letters, Vol. 102, No. 24, 241604, 17.06.2013.

Research output: Contribution to journal › Article › peer-review

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AU - Fukidome, Hirokazu

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