Herein, we report the synthesis and characterization of a series of ambipolar cyanostyrylthiophene (CST)-based conjugated polymers without or with fluorine substituents, namely PD-CST, PD-3F-CST, PD-23F-CST, and PD-25F-CST. With the change of the number or incorporating position of fluorine substitutes on the novel CST unit, the electron mobilities of field-effect transistors based on these polymers dramatically increased from 0.0015 cm² V^–1 s^–1 for PD-CST, 0.13 cm² V^–1 s^–1 for PD-3F-CST, and 0.25 cm² V^–1 s^–1 for PD-23F-CST to 0.53 cm² V^–1 s^–1 for PD-25F-CST. AFM and GIXRD investigation indicated that the annealed PD-25F-CST thin film possesses stronger crystallization tendency and highly ordered lamellar packing than those of the other polymers. Further theoretical calculations and single-crystal X-ray diffraction analysis deeply revealed the remarkable influences of the number and incorporating position of fluorine substitutes on the frontier orbital energy levels, backbone conformation, and charge transport properties of polymer semiconductors.

中文翻译：

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基于氰基苯乙烯基噻吩的双极共轭聚合物：主链氟化作用的合成，性质和分析

本文中，我们报道了一系列具有或不具有氟取代基的双极性氰基苯乙烯基噻吩（CST）基共轭聚合物的合成和表征，即PD-CST，PD-3F-CST，PD-23F-CST和PD-25F-CST。随着数目的变化或氟代用品结合位置的新颖上CST单元，基于这些聚合物从0.0015厘米急剧增加场效应晶体管的电子迁移率² V ^-1小号^-1为PD-CST，0.13厘米² V ^–1 s ^–1（对于PD-3F-CST）和0.25 cm² V ^-1小号^-1为PD-23F-CST到0.53厘米² V ^-1小号^-1为PD-25F-CST。AFM和GIXRD研究表明，退火后的PD-25F-CST薄膜比其他聚合物具有更强的结晶趋势和高度有序的层状堆积。进一步的理论计算和单晶X射线衍射分析深刻地揭示了氟代用品的数量和掺入位置对聚合物半导体的前沿轨道能级，主链构象和电荷传输性质的显着影响。