Effects of Molecular Structure on Intramolecular Charge Carrier Transport in Dithieno [3,2-b: 2,3-d] Pyrrole-Based Conjugated Copolymers

Yoshihito Honsho, A. Saeki, S. Seki
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引用次数: 4

Abstract

Intramolecular mobility of positive charge carriers in conjugated polymer films based on dithieno [2,3- b: 2  , 3  - d] pyrrole (DTP) is studied by time-resolved microwave conductivity (TRMC). A series of DTP homopolymer and copolymers combined with phenyl, 2, 2  -biphenyl, thiophene, 2, 2  -bithiophene, and 9, 9  -dioctylfluorene were synthesized by Suzuki-Miyaura and Yamamoto coupling reactions. Polymers containing DTP unit are reported to show high value of hole mobility measured by FET method, and this type of polymers is expected to have stable HOMO orbitals which are important for hole transportation. Among these copolymers, DTP coupled with 9, 9  -dioctylfluorene copolymer showed the highest charge carrier mobility as high as 1.7 cm 2/Vs, demonstrating an excellent electrical property on rigid copolymer backbones.
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分子结构对二噻吩[3,2-b: 2,3-d]吡咯基共轭共聚物分子内载流子输运的影响
利用时间分辨微波电导率(TRMC)研究了二噻吩[2,3- b: 2,3- d]吡咯(DTP)共轭聚合物膜中正电荷载流子的分子内迁移率。通过Suzuki-Miyaura和Yamamoto偶联反应,合成了一系列与苯基、2,2-联苯、噻吩、2,2-二噻吩和9,9-二辛基芴结合的DTP均聚物和共聚物。据报道,含有DTP单元的聚合物显示出高的空穴迁移率,并且这类聚合物有望具有稳定的HOMO轨道,这对空穴迁移至关重要。在这些共聚物中,DTP与9,9-二辛基氟共聚物偶联的载流子迁移率最高,高达1.7 cm 2/Vs,在刚性共聚物骨架上表现出优异的电学性能。
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