Gilhooly-Finn, Peter A; Jacobs, Ian E; Bardagot, Olivier; Zaffar, Yasser; Lemaire, Antoine; Guchait, Shubhradip; Zhang, Lu; Freeley, Mark; Neal, William; Richard, Fanny; Palma, Matteo; Banerji, Natalie; Sirringhaus, Henning; Brinkmann, Martin; Nielsen, Christian B (2023). Interplay between Side Chain Density and Polymer Alignment: Two Competing Strategies for Enhancing the Thermoelectric Performance of P3HT Analogues. Chemistry of materials, 35(21), pp. 9029-9039. American Chemical Society 10.1021/acs.chemmater.3c01680
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A series of polythiophenes with varying side chain density was synthesized, and their electrical and thermoelectric properties were investigated. Aligned and non-aligned thin films of the polymers were characterized in the neutral and chemically doped states. Optical and diffraction measurements revealed an overall lower order in the thin films with lower side chain density, also confirmed using polarized optical experiments on aligned thin films. However, upon doping the non-aligned films, a sixfold increase in electrical conductivity was observed for the polythiophene with the lowest side chain density compared to poly(3-hexylthiophene) (P3HT). We found that the improvement in conductivity was not due to a larger charge carrier density but an increase in charge carrier mobility after doping with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ). On the other hand, doped aligned films did not show the same trend; lower side chain density instead led to a lower conductivity and Seebeck coefficient compared to those for P3HT. This was attributed to the poorer alignment of the polymer thin films with lower side chain density. The study demonstrates that optimizing side chain density is a synthetically simple and effective way to improve electrical conductivity in polythiophene films relevant to thermoelectric applications.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) |
UniBE Contributor: |
Bardagot, Olivier Nicolas Ludovic, Banerji, Natalie |
Subjects: |
500 Science > 570 Life sciences; biology 500 Science > 540 Chemistry |
ISSN: |
0897-4756 |
Publisher: |
American Chemical Society |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
04 Dec 2023 11:23 |
Last Modified: |
04 Dec 2023 11:32 |
Publisher DOI: |
10.1021/acs.chemmater.3c01680 |
PubMed ID: |
38027547 |
BORIS DOI: |
10.48350/189619 |
URI: |
https://boris.unibe.ch/id/eprint/189619 |
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