Toward High Thermoelectric Performance of Thiophene and Ethylenedioxythiophene (EDOT) Molecular Wires

Famili, Marjan and Grace, Iain M. and Al-galiby, Qusiy and Sadeghi, Hatef and Lambert, Colin J. (2018) Toward High Thermoelectric Performance of Thiophene and Ethylenedioxythiophene (EDOT) Molecular Wires. Advanced Functional Materials, 28 (15). ISSN 1616-301X

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Abstract

The design of thermoelectric materials for the efficient conversion of waste heat into electricity requires simultaneous tuning of their electrical and thermal conductance. A comparative theoretical study of electron and phonon transport in thiophene and ethylenedioxythiophene (EDOT) based molecular wires is performed. It is shown that modifying thiophene by substituting ethylenedioxy enhances the thermoelectric figure of merit ZT for molecules of the same length. Furthermore, it is demonstrated that the electrical conductance of EDOT-based wires decays more slowly with length than that of thiophene-based wires and that their thermal conductance is lower. The room-temperature ZT of undoped EDOT is found to be rather low. However, doping of EDOT by the electron acceptor tolunenesulfunate increases the Seebeck coefficient and electrical conductance, while decreasing the thermal conductance, leading to a thermoelectric figure of merit as high as ZT = 2.4.

Item Type:
Journal Article
Journal or Publication Title:
Advanced Functional Materials
Additional Information:
This is the peer reviewed version of the following article: M. Famili, I. M. Grace, Q. Al‐Galiby, H. Sadeghi, C. J. Lambert, Adv. Funct. Mater. 2018, 28, 1703135. https://doi.org/10.1002/adfm.201703135 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/adfm.201703135/abstract This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Subjects:
ID Code:
123559
Deposited By:
Deposited On:
20 Feb 2018 17:50
Refereed?:
Yes
Published?:
Published
Last Modified:
29 May 2020 04:06