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Observation of the transition from tunneling to hopping carrier transport through single oligothiophene molecules

Published online by Cambridge University Press:  01 February 2011

Ryo Yamada ,
Hiroaki Kumazawa ,
Shoji Tanaka  and
Hirokazu Tada
Ryo Yamada
Affiliation:
yamada@molectronics.jp, Osaka University, Graduate School of Engineering Science, Machikaneyama 1-3, Toyonaka, 560-8531, Japan
Hiroaki Kumazawa
Affiliation:
kumazawa@molectronics.jp, Osaka University, Graduate School of Engineering Science, Machikaneyama 1-3, Toyonaka, 560-8531, Japan
Shoji Tanaka
Affiliation:
tanaka@ims.ac.jp, Institute for Molecular Science, Research Center for Molecular-scale Nano Science, Myodaijicho, Okazaki, N/A, Japan
Hirokazu Tada
Affiliation:
tada@molectronics.jp, Osaka University, Graduate School of Engineering Science, Machikaneyama 1-3, Toyonaka, 560-8531, Japan
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Abstract

Electrical conductance of single oligothiophene molecules with a length in the range from 2 to 9 nm was measured as a function of molecular length by a break junction method. The resistance of oligothiophenes increased exponentially from 5-mer to 14-mer while that of molecules longer than 17-mer showed linear dependence on their length. These results indicated that the carrier transport mechanism changed from tunneling to hopping around 14-mer of which the length is approximately 6 nm.

Keywords

electrical propertiesorganicnanoscale

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