High-Electron Mobility Tetrafluoroethylene-Containing Semiconducting Polymers

作者：Zhihui Chen, Weifeng Zhang, Congyuan Wei, Yankai Zhou, Yuchai Pan, Xuyang Wei, Jianyao Huang, Liping Wang, Gui Yu · 发表于：Chemistry of Materials · 年份：2020 · DOI：10.1021/acs.chemmater.9b04425 · 被引用次数：25 · 研究领域：Organic Electronics and Photovoltaics、Conducting polymers and applications、Advanced Sensor and Energy Harvesting Materials

Herein, we report a series of tetrafluoroethylene (TFE)-containing semiconducting polymers PNBDO-FDTE m ( m = 90, 80, 70, 60, and 0), in which the TFE segments were first introduced into polymeric main chains as flexible π-nonconjugated nodes, and its fully conjugated analogue PNBDO-FDTE100 . Our results indicate that the TFE segment is quite compatible with the NBDO- alt -FDTE conjugated matrix system. The HOMO/LUMO energy levels (approximately −6.0/–4.0 eV) and optical band gaps (1.28 eV) remain almost the same in the polymers with the TFE content varying from 0% to 40%. The polymers PNBDO-FDTE m ( m = 90, 80, 70, and 60) have similar highly ordered molecular packing with close π–π stacking in a thin film as PNBDO-FDTE100 does, implying that the TFE segments exert no clear negative influences on the molecular packing of these polymers either. PNBDO-FDTE100 exhibited a much high electron mobility (μ e ) of 7.43 cm 2 V –1 s –1, while PNBDO-FDTE90 and PNBDO-FDTE80 also showed impressively high μ e values of 7.25 and 6.00 cm 2 V –1 s –1, respectively. However, PNBDO-FDTE m ( m = 70, 60, and 0) afforded a μ e as low as 0.182 cm 2 V –1 s –1 . We attributed this to the transition of the carrier transport mode caused by the increase in the number of π-nonconjugated nodes.