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Citation: Jie-ming Zheng, Xin-bo Wen, Jia-dong Zhou, Nan Zheng, Zeng-qi Xie. Research Progress on Aggregation Structure of Conjugated Polymers in Multicomponent Blends[J]. Acta Polymerica Sinica, ;2019, 50(8): 775-807. doi: 10.11777/j.issn1000-3304.2019.19062 shu

Research Progress on Aggregation Structure of Conjugated Polymers in Multicomponent Blends

  • State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640

  • Conjugated polymers have attracted much attention due to their unique electronic properties and solution processing methods. The rigid and planar conformational backbone manifests extended π-system and the flexible alkyl chain assures the sufficient solubility, which contribute to their tuneable physical and chemical properties and increase the tolerance of film forming and mechanical flexibility. In general, the orthogonal design of functional fragments for conjugated polymers make it accessible for π-stacking of conjugated segments and lamellar stacking of interchain interactions. Short-range aggregates or long-range microcrystals would be selectively and/or successively formed by controlling their chemical structures and processing conditions. Such stacking structure in the phase-separated domain is crucial to the high efficient performance of bulk heterojunction solar cells. The aggregation structure of some typical conjugated polymers has recently been reviewed with a view to providing reference for the development of optoelectrics in this study. Here, D-A copolymers based on oligothiophene, dithiophene, benzothiophene and thiophene derivatives, two-dimensional conjugated polymers and block copolymers are introduced in detail. The aggregation structure of a series of conjugated polymers is systematically summarized by using the different processing techniques, such as selective counterpart components, treating solvents and annealing temperature. In addition, the intrinsic motivation of the controllable aggregation structure is discussed from the aspects of molecular weight and side chain groups.
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