Tuning conformation, assembly, and charge transport properties of conjugated polymers by printing flow

Kyung Sun Park, Justin J. Kwok, Rishat Dilmurat, Ge Qu, Prapti Kafle, Xuyi Luo, Seok Heon Jung, Yoann Olivier, Jin Kyun Lee, Jianguo Mei, David Beljonne, Ying Diao

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    Abstract

    Intrachain charge transport is unique to conjugated polymers distinct from inorganic and small molecular semiconductors and is key to achieving high-performance organic electronics. Polymer backbone planarity and thin film morphology sensitively modulate intrachain charge transport. However, simple, generic nonsynthetic approaches for tuning backbone planarity and the ensuing multiscale assembly process do not exist. We first demonstrate that printing flow is capable of planarizing the originally twisted polymer backbone to substantially increase the conjugation length. This conformation change leads to a marked morphological transition from chiral, twinned domains to achiral, highly aligned morphology, hence a fourfold increase in charge carrier mobilities. We found a surprising mechanism that flow extinguishes a lyotropic twist-bend mesophase upon backbone planarization, leading to the observed morphology and electronic structure transitions.

    Original languageEnglish
    Article numbereaaw7757
    Pages (from-to)eaaw7757
    JournalScience Advances
    Volume5
    Issue number8
    DOIs
    Publication statusPublished - 9 Aug 2019

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