Electrical Conductance of Single Oligothiophene Molecular Wires: Temperature Effect

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.

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Lee, S.K., Yamada, R., Tanaka, S. et al. Electrical Conductance of Single Oligothiophene Molecular Wires: Temperature Effect. MRS Online Proceedings Library 1286, 1101 (2010). https://doi.org/10.1557/opl.2011.12

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