Issue 36, 2020

Electronic conductance and thermopower of single-molecule junctions of oligo(phenyleneethynylene) derivatives

Abstract

We report the synthesis and the single-molecule transport properties of three new oligo(phenyleneethynylene) (OPE3) derivatives possessing terminal dihydrobenzo[b]thiophene (DHBT) anchoring groups and various core substituents (phenylene, 2,5-dimethoxyphenylene and 9,10-anthracenyl). Their electronic conductance and their Seebeck coefficient have been determined using scanning tunneling microscopy-based break junction (STM-BJ) experiments between gold electrodes. The transport properties of the molecular junctions have been modelled using DFT-based computational methods which reveal a specific binding of the sulfur atom of the DHBT anchor to the electrodes. The experimentally determined Seebeck coefficient varies between −7.9 and −11.4 μV K−1 in the series and the negative sign is consistent with charge transport through the LUMO levels of the molecules.

Graphical abstract: Electronic conductance and thermopower of single-molecule junctions of oligo(phenyleneethynylene) derivatives

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Supplementary files

Article information

Article type
Paper
Submitted
10 juin 2020
Accepted
31 août 2020
First published
09 sept. 2020
This article is Open Access
Creative Commons BY license

Nanoscale, 2020,12, 18908-18917

Electronic conductance and thermopower of single-molecule junctions of oligo(phenyleneethynylene) derivatives

H. Dekkiche, A. Gemma, F. Tabatabaei, A. S. Batsanov, T. Niehaus, B. Gotsmann and M. R. Bryce, Nanoscale, 2020, 12, 18908 DOI: 10.1039/D0NR04413J

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