Ambipolar transport behavior in isoindigo-based conjugated polymers is observed for the first time. Fluorination on the isoindigo unit effectively lowers the LUMO level of the polymer and significantly increases the electron mobility from 10(-2) to 0.43 cm(2) V(-1) s(-1) while maintaining high hole mobility up to 1.85 cm(2) V(-1) s(-1) for FET devices fabricated in ambient. Further investigation indicates
首次观察到基于异靛蓝的共轭聚合物的双极性传输行为。异靛蓝单元上的氟化有效地降低了聚合物的 LUMO水平,并显着增加了电子迁移率从 10(-2) 到 0.43 cm(2) V(-1) s(-1),同时保持高达 1.85 cm 的高空穴迁移率(2) V(-1) s(-1) 对于在环境中制造的 FET 器件。进一步的研究表明,氟化也会影响聚合物主链的链间相互作用,从而导致薄膜中不同的聚合物堆积。
P(PzDPP-CT2) exhibits high n-type electrical conductivities of up to 8.4 S cm-1 and power factors of up to 57.3 μW m-1 K-2. These values are much higher than previously reported n-doped DPP polymers, and the power factor also ranks the highest in solution-processable n-doped conjugated polymers. These results suggest that PzDPP is a promising high-performance buildingblock for n-typeorganic thermoelectrics
n 掺杂共轭聚合物通常表现出低电导率和低热电功率因数,限制了它们在 n 型有机热电中的应用。在这里,我们报告了一种新的二酮吡咯并吡咯 (DPP) 衍生物、吡嗪侧翼 DPP (PzDPP) 的合成,在所有报道的 DPP 衍生物中具有最深的 LUMO水平。基于PzDPP,合成了供体-受体共聚物P(PzDPP-CT2)。该聚合物显示出深 LUMO 能级和强链间相互作用,π-π 堆积距离短,为 3.38 Å。当掺杂有 n 型掺杂剂 N-DMBI 时,P(PzDPP-CT2) 表现出高达 8.4 S cm-1 的高 n 型电导率和高达 57.3 μW m-1 K-2 的功率因数。这些值远高于先前报道的 n 掺杂 DPP聚合物,功率因数在可溶液加工的 n 掺杂共轭聚合物中也名列前茅。这些结果表明 PzDPP 是一种很有前途的高性能 n 型有机热电构件,并且还强调了在不牺牲聚合物链间相互作用的情况下
Chlorination as a useful method to modulate conjugated polymers: balanced and ambient-stable ambipolar high-performance field-effect transistors and inverters based on chlorinated isoindigo polymers
For the first time, ambient-stable and balanced carrier transport is achieved in polymer ambipolar field-effect transistors (FETs) and inverters with high performance. With chlorinated isoindigo polymers, FETs fabricated in ambient conditions show hole mobilities up to 0.81 cm2 V−1 s−1 and dramatically increased electron mobilities from 10−2 to 0.66 cm2 V−1 s−1. Hence, chlorination is effective to modulate electronic properties and improve the device performance of conjugated polymers.