Fused Bithiophene Imide Oligomer and Diketopyrrolopyrrole Copolymers for n-Type Thin-Film Transistors

Yujie Zhang, Linjing Tang, Huiliang Sun, Shaohua Ling, Kun Yang, Mohammad Afsar Uddin, Han Guo, Yumin Tang, Yang Wang, Kui Feng, Yongqiang Shi, Juqing Liu, Shiming Zhang, Han Young Woo, Xugang Guo

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    Diketopyrrolopyrrole (DPP)-based copolymers have received considerable attention as promising semiconducting materials for high-performance organic thin-film transistors (OTFTs). However, these polymers typically exhibit p-type or ambipolar charge-transporting characteristics in OTFTs due to their high-lying highest occupied molecular orbital (HOMO) energy levels. In this work, a new series of DPP-based n-type polymers have been developed by incorporating fused bithiophene imide oligomers (BTIn) into DPP polymers. The resulting copolymers BTIn-DPP show narrow band gaps as low as 1.27 eV and gradually down-shifted frontier molecular orbital energy levels upon the increment of imide group number. Benefiting from the coplanar backbone conformation, well-delocalized π-system, and favorable polymer chain packing, the optimal polymer in the series shows promising n-type charge transport with an electron mobility up to 0.48 cm2 V−1 s−1 in OTFTs, which is among the highest values for the DPP-based n-type polymers reported to date. The results demonstrate that incorporating fused bithiophene imide oligomers into polymers can serve as a promising strategy for constructing high-performance n-type polymeric semiconductors.

    Original languageEnglish
    Article number1900394
    JournalMacromolecular Rapid Communications
    Volume40
    Issue number23
    DOIs
    Publication statusPublished - 2019 Dec 1

    Bibliographical note

    Publisher Copyright:
    © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

    Keywords

    • bithiophene imide
    • diketopyrrolopyrrole
    • n-type polymer semiconductors
    • organic thin-film transistors

    ASJC Scopus subject areas

    • Organic Chemistry
    • Polymers and Plastics
    • Materials Chemistry

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