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A novel planar D-A alternating copolymer with D-A integrated structures exhibiting H-aggregate behaviors for polymer solar cells

Authors

  • Shujiao Cai,

    1. Institute of Polymers/Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
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  • Lie Chen,

    Corresponding author
    1. Institute of Polymers/Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
    2. Jiangxi Provincial Key Laboratory of New Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
    • Institute of Polymers/Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
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  • Daijun Zha,

    1. Institute of Polymers/Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
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  • Yiwang Chen

    Corresponding author
    1. Institute of Polymers/Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
    2. Jiangxi Provincial Key Laboratory of New Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
    • Institute of Polymers/Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
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Abstract

With the D-A integrated structure concept, a new donor–acceptor (D-A) copolymer poly{(N-dodecyl-carbazole[3,4-c:5,6-c]bis[1,2,5]thiadiazole-alt-4,8-di(2-ethylhexy-loxyl)benzo[1,2-b:4,5-b′]dithiophene)} has been designed and synthesized using a novel architecture N-dodecyl-carbazole[3,4-c:5,6-c]bis[1,2,5]thiadiazole, and di(2-ethylhexy-loxyl)benzo[1,2-b:4,5-b′]dithiophene) as the basic building blocks. The copolymer has a low-lying highest occupied molecular orbital energy level of −5.41 eV and a broaden absorption matching well with the main solar photon flux. Note that an H-aggregation beneficial for charge transportation and collection is formed in the macromolecules film, which implies that the planar D-A integrated structure favors the strong intermolecular interaction to render molecules aggregated via face-to-face self-assembly. The aggregation becomes larger scale after thermal annealing. Additionally, obvious intramolecular charge transfer and energy transfer have occurred in created D-A integration. Without any treatment, the resulting polymer achieved a efficiency of 2.0% and relatively high open-circuit voltage (Voc) value of 0.77 V when blended with [6,6]-phenyl-C61-butyric acid methyl ester in a typical bulk heterojunction. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013

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