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Electrical Conductance of Single Oligothiophene Molecular Wires: Temperature Effect

Published online by Cambridge University Press:  14 January 2011

See Kei Lee ,
Ryo Yamada ,
Shoji Tanaka  and
Hirokazu Tada
See Kei Lee
Affiliation:
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan.
Ryo Yamada
Affiliation:
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan.
Shoji Tanaka
Affiliation:
Research Center for Molecular Scale Nanoscience, Institute for Molecular Science, Okazaki, Aichi, Japan.
Hirokazu Tada
Affiliation:
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, Japan.
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Abstract

We investigated temperature dependence of the electrical conductance of single oligothiophene molecular wires with the length of 2.2 nm (5-mer), 5.6 nm (14-mer) and 6.7 nm (17-mer) by using the scanning tunneling microscopy break junction method. Results show that the dominant charge carrier transport for 5-mer molecule is tunneling while for 17-mer molecule is hopping. The carrier transport mechanism of 14-mer are tunneling transport (T ≤ 350 K) and hopping transport (T > 350 K) indicating that hopping and tunnelling transport are competitive process in the molecular junction.

Keywords

organicscanning tunneling microscopy (STM)nanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1286: Symposium E – Molecular and Hybrid Materials for Electronics and Photonics , 2011 , mrsf10-1286-e11-01
Copyright
Copyright © Materials Research Society 2011

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