A vinyl flanked difluorobenzothiadiazole–dithiophene conjugated polymer for high performance organic field-effect transistors

Fluorine containing conjugated polymers have been widely applied in high performance organic solar cells, but their use in field-effect transistors is still quite limited. In this work, a conjugated polymer PTFBTV based on difluorobenzothiadiazole (DFBT) and dithiophene was synthesized, utilizing mu...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2018, Vol.6 (7), p.1774-1779
Main Authors: Liang, Xianfeng, Sun, Wandong, Chen, Yanlin, Tan, Luxi, Cai, Zhengxu, Liu, Zitong, Wang, Lin, Li, Jing, Chen, Wei, Dong, Lichun
Format: Article
Language:English
Subjects:
Chemical synthesis
Crystal structure
Field effect transistors
Fluorine
Hole mobility
MATERIALS SCIENCE
Photovoltaic cells
Polymer films
Polymers
Semiconductor devices
Single crystals
Solar cells
Transistors
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Summary:Fluorine containing conjugated polymers have been widely applied in high performance organic solar cells, but their use in field-effect transistors is still quite limited. In this work, a conjugated polymer PTFBTV based on difluorobenzothiadiazole (DFBT) and dithiophene was synthesized, utilizing multiple vinylene as linkers. The polymer exhibits a relatively high hole mobility up to 2.0 cm 2 V −1 s −1 compared with the reported DFBT–oligothiophene based polymers, yet its structural complexity is much simpler. The polymer thin film exhibits a typical ‘face on’ molecular orientation. A single crystal of its monomer revealed a non-covalent intramolecular contact between fluorine and the neighbouring proton, which strengthens the backbone co-planarity. Meanwhile an intermolecular F⋯F contact was also observed, which might cause rather scattered lamellar crystallinity for PTFBTV in the solid state.
ISSN:2050-7526
2050-7534
DOI:10.1039/C7TC05360F