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Radical-assisted chemical doping for chemically derived graphene

Ryousuke Ishikawa1*, Pil Ju Ko12*, Masashi Bando1, Yasuyoshi Kurokawa3, Adarsh Sandhu12 and Makoto Konagai34

Author Affiliations

1 Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152-8552, Japan

2 Electronics-Inspired Interdisciplinary Research Institute (EIIRIS), Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan

3 Department of Physical Electronics, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152-8552, Japan

4 Photovoltaics Research Center (PVREC), Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152-8552, Japan

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Nanoscale Research Letters 2013, 8:534  doi:10.1186/1556-276X-8-534

Published: 19 December 2013

Abstract

Carrier doping of graphene is one of the most challenging issues that needs to be solved to enable its use in various applications. We developed a carrier doping method using radical-assisted conjugated organic molecules in the liquid phase and demonstrated all-wet fabrication process of doped graphene films without any vacuum process. Charge transfer interaction between graphene and dopant molecules was directly investigated by spectroscopic studies. The resistivity of the doped graphene films was drastically decreased by two orders of magnitude. The resistivity was improved by not only carrier doping but the improvement in adhesion of doped graphene flakes. First-principles calculation supported the model of our doping mechanism.

Keywords:
Chemically derived graphene; Transparent conductive films; Carrier doping; Charge transfer; Radicalized organic conductors; First-principles calculation