High performance all-polymer photodetector comprising a donor-Acceptor-Acceptor structured indacenodithiophene-bithieno[3,4-c] pyrroletetrone copolymer

Petri Murto, Zewdneh Genene, Cindy Montenegro Benavides, Xiaofeng Xu, Anirudh Sharma, Xun Pan, Oliver Schmidt, Christoph J. Brabec, Mats R. Andersson, Sandro F. Tedde, Wendimagegn Mammo, Ergang Wang

    Research output: Contribution to journalArticle

    21 Citations (Scopus)

    Abstract

    The synthesis of an acceptor polymer PIDT-2TPD, comprising indacenodithiophene (IDT) as the electron-rich unit and an interconnected bithieno[3,4-c]pyrrole-4,4′,6,6′-Tetrone (2TPD) as the electron-deficient unit, and its application for all-polymer photodetectors is reported. The optical, electrochemical, charge transport, and device properties of a blend of poly(3-hexylthiophene) and PIDT-2TPD are studied. The blend shows strong complementary absorption and balanced electron and hole mobility, which are desired properties for a photoactive layer. The device exhibits dark current density in the order of 10 -5 mA/cm 2 , external quantum efficiency broadly above 30%, and nearly planar detectivity over the entire visible spectral range (maximum of 1.1 × 10 12 Jones at 610 nm) under-5 V bias. These results indicate that PIDT-2TPD is a highly functional new type of acceptor and further motivate the use of 2TPD as a building block for other n-Type materials.

    Original languageEnglish
    Pages (from-to)395-400
    Number of pages6
    JournalACS Macro Letters
    Volume7
    Issue number4
    DOIs
    Publication statusPublished - 14 Mar 2018

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