A Novel Thiophene Derivative-based Conjugated Polymer for Polymer Solar Cells with High Open-circuit Voltage

Authors

  • Lie Chen,

    1. Department of Chemistry/Institute of Polymers, Nanchang University, Nanchang, Jiangxi 330031, China
    2. Jiangxi Key Laboratory for New Energy Chemistry, Nanchang University, Nanchang, Jiangxi 330031, China
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  • Xingxing Shen,

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

    Corresponding author
    1. Department of Chemistry/Institute of Polymers, Nanchang University, Nanchang, Jiangxi 330031, China
    2. Jiangxi Key Laboratory for New Energy Chemistry, Nanchang University, Nanchang, Jiangxi 330031, China
    • Department of Chemistry/Institute of Polymers, Nanchang University, Nanchang, Jiangxi 330031, China, Tel.: 0086-0791-83969562; Fax: 0086-0791-83969561
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Abstract

A novel D-A alternative conjugated polymer PBDTDMCT containing benzo[1,2-b:4,5-b′]dithiophene (BDT) and dimethyl thiophene-3,4-dicarboxylate (DMCT), was designed and synthesized by Stille cross-coupling reaction. The copolymer exhibited excellent solubility and good thermal stability. The optical band gap determined from the onset of absorption of the polymer film was 2.10 eV. By incorporation of the ester groups into the polymer side chain, the HOMO level of polymer PBDTDMT was tuned to be deep-lying (−5.65 eV). Open-circuit voltage of polymer solar cells constructed based on PBDTDMT and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) can be tuned to achieve values as high as ca. 1.0 V.

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