Broad spectrum absorption and low-voltage electrochromic operation from indacenodithieno[3,2-b]thiophene-based copolymers

Kim Bini, Petri Murto, Sait Elmas, Mats R. Andersson, Ergang Wang

    Research output: Contribution to journalArticle

    4 Citations (Scopus)
    12 Downloads (Pure)

    Abstract

    Electrochromic performance of conjugated polymers has quickly become an important design factor in a variety of applications. There is still significant need to develop highly stable materials with high optical contrast, desired colour switching and fast kinetics. Here, poly[indacenodithieno[3,2-b]thiophene-2,8-diyl] (PIDTT) is introduced as a new type of electrochromic polymer exhibiting a narrow absorption band, excellent electrochemical stability and fast colour switching kinetics between vibrant red (peak maximum at ∼550 nm) and transparent (peak maximum at ∼920 nm) within a low potential range of 0-0.8 V. To widen the spectral coverage of the well-functioning PIDTT over the entire visible range, a modified donor-acceptor approach is used by incorporating three different donor-acceptor-donor (DAD) segments into an indacenodithieno[3,2-b]thiophene (IDTT) based polymer backbone, so as to obtain three different alternating copolymers. This design motif is further rationalized by the maintained electrochemical stability of the new copolymers, and their full colour switching between black and transparent down to an ultra-low potential range of 0-0.6 V.

    Original languageEnglish
    Pages (from-to)2004-2014
    Number of pages11
    JournalPolymer Chemistry
    Volume10
    Issue number16
    DOIs
    Publication statusPublished - 28 Apr 2019

    Keywords

    • Electrochromic performance
    • conjugated polymers
    • poly[indacenodithieno[3,2-b]thiophene-2,8-diyl] (PIDTT)

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