Evidence of edge conduction at nanotube/metal contact in carbon nanotube devices

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Nosho, Yosuke [1 ]
Ohno, Yutaka [1 ,2 ]
Kishimoto, Shigeru [1 ,3 ]
Mizutani, Takashi [1 ,4 ]
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[1] Department of Quantum Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
[2] PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
[3] Venture Business Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
[4] Institute for Advanced Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
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We have investigated the current flow path between the nanotube and the contact electrode in carbon nanotube devices using multiprobe devices. The contact and channel resistances have been evaluated by two methods; transmission-line-model technique and four-probe measurement. By comparing the results; we have found that channel resistance evaluated by the four-probe measurement includes contact resistance. This indicates that the widely used four-probe measurement is not applicable to nanotube devices for the evaluation of channel resistance excluding contact resistance. This finding also implies that electron transport between the nanotube and the contact metal occurs at the edge of the contact electrode. ©2007 The Japan Society of Applied Physics;
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