Regulation of microstructure and charge transport properties of cyclopentadiene-based conjugated polymers via side-chain engineering
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
Conjugated polymers containing non-aromatic cyclopentadiene (Cp) units have shown great application potential in high performance organic field effect transistors (OFETs). However, the relationship between the structure and properties of Cp-based polymers is underexplored, limiting further improvement of the OFET characteristics of these materials. Herein, we synthesized three copolymers of Cp and diketopyrrolopyrrole (DPP) units with side chains of different branching position and lengths PDPPCp-C4-OD, PDPPCp-C7-OD, and PDPPCp-C7-HO. It is found that the alkyl side chain structure has little effect on the thermal, optical, and electronic properties of the resulting polymers, but significantly influences the thin film microstructure. Among them, PDPPCp-C7-HO with a longer linear alkyl spacer as well as shorter branches adopted the most compact and ordered film microstructure, exhibiting the shortest π–π stacking distance, the largest lamellar coherence length and the highest degree of edge-on orientation in thin film after annealing at 200 °C. As a result, PDPPCp-C7-HO exhibited the highest hole mobility of 2.1 cm2 V−1 s−1 in OFET devices.
Date Issued
2024-03-14
Date Acceptance
2024-02-06
Citation
Journal of Materials Chemistry C, 2024, 12 (10), pp.3549-3556
ISSN
2050-7526
Publisher
Royal Society of Chemistry
Start Page
3549
End Page
3556
Journal / Book Title
Journal of Materials Chemistry C
Volume
12
Issue
10
Copyright Statement
This journal is © The Royal Society of Chemistry 2024. This is the author’s accepted manuscript made available under a CC-BY licence in accordance with Imperial’s Research Publications Open Access policy (www.imperial.ac.uk/oa-policy)
License URL
Identifier
http://dx.doi.org/10.1039/d4tc00258j
Publication Status
Published
Date Publish Online
2024-02-08