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Issue 36, 2020

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

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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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Article information


Submitted
10 Jun 2020
Accepted
31 Aug 2020
First published
09 Sep 2020

This article is Open Access

Nanoscale, 2020,12, 18908-18917
Article type
Paper

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

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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