Influence of Backbone Regioregularity on High-Mobility Conjugated Polymers Based on Alkylated Dithienylacrylonitrile
Influence of Backbone Regioregularity on High-Mobility Conjugated Polymers Based on Alkylated Dithienylacrylonitrile
复制标题
主链立体规整性对烷基化二噻吩基丙烯腈高迁移率共轭聚合物的影响
DOI：
10.1021/acsami.9b14757
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发表时间：
2019-11-20
影响因子：
9.5
通讯作者：
Yu, Gui
中科院分区：
文献类型：
--
作者：
Li, Dizao;Wang, Qiang;Yu, Gui
以二酮吡咯（DPP）和烷基化二乙烯基丙烯腈（CNTVT）为单元，设计并合成了两种供受体型共轭聚合物，即区域不规则聚合物RI-PDPP-CNTVT-6和区域规则聚合物RR-PDPP-CNTVT-6。其中，DPP受体单元上的2-癸基十四烷基侧链和CNTVT给体单元上的己基侧链被用来保证它们有足够的溶解度。利用主链区域规则来调节共轭体系的电子结构和载流子输运。表征了这两种共轭聚合物的热学、光物理、电化学和溶液加工性能、薄膜微结构和形貌。基于这两种共轭聚合物的顶栅底接触结构有机场效应晶体管（OFET）器件具有优异的双极性性能。值得注意的是，区域不规则聚合物RI-PDPP-CNTVT-6比区域规则聚合物RR-PDPP-CNTVT-6表现出更高的载流子迁移率，其最高空穴/电子迁移率(mu（hmax)/mu(emax)）分别为1.48/1.27和0.48/0.052 cm(2) V-1 s（-1）。此外，还深入研究了骨架区域规则性对其热稳定性、电化学和光物理性质、溶液可加工性和载流子迁移率的影响。我们的研究结果为开发高性能、良好的溶液可加工性和热稳定性的双极性ofet提供了一条有希望的途径。
We designed and synthesized two donor acceptor type conjugated polymers, the regioirregular polymer RI-PDPP-CNTVT-6 and its regioregular counterpart RR-PDPP-CNTVT-6, based on diketopyrrolopyrrole (DPP) and alkylated dithienylacrylonitrile (CNTVT) units. Among them, the 2-decyltetradecyl side chain on the DPP acceptor unit and the hexyl side chain on the CNTVT donor unit were used to ensure enough solubility for them. The backbone regioregularity was used to tune electronic structures and carrier transport of the conjugated system. The two conjugated polymers were characterized for their thermal, photophysical, electrochemical, and solution-processable properties, thin-film microstructures, and morphologies. The top-gate bottom-contact configuration organic field-effect transistor (OFET) devices based on these two conjugated polymers showed excellent ambipolar performances. Remarkably, the regioirregular polymer RI-PDPP-CNTVT-6 exhibited higher charge-carrier mobilities than the regioregular counterpart polymer RR-PDPP-CNTVT-6 did, as their highest hole/electron mobilities (mu(hmax)/mu(emax)) were 1.48/1.27 and 0.48/0.052 cm(2) V-1 s(-1), respectively. Moreover, the influence of backbone regioregularity on its thermal stability, electrochemical and photophysical properties, solution processability, and charge-carrier mobility was intensively studied. Our results afforded a promising pathway toward the development of excellent ambipolar OFETs with high performance, good solution processability, and thermal stability.