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

• 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
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/c7tc05360f

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. A vinyl flanked conjugated polymer PTFBTV exhibits a hole mobility up to 2.0 cm 2 V −1 s −1 containing possible C-H F hydrogen bonds