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Issue 43, 2018
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Near-infrared organic photodetectors based on bay-annulated indigo showing broadband absorption and high detectivities up to 1.1 μm

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Abstract

Near-infrared photodetection is valuable for numerous scientific, industrial and recreational applications. The implementation of organic semiconductors in near-infrared photodetectors offers additional advantages, such as printability on flexible substrates, reduced manufacturing costs and facile tuning of the detection range. In this work, the nature-inspired bay-annulated indigo (BAI) dye is employed as a building block for near-infrared sensitive, push–pull type conjugated polymers. The electron-deficient BAI moiety is copolymerized with a set of electron-rich monomers, affording polymers with an absorption onset up to 1300 nm and a sufficiently high lowest unoccupied molecular orbital, allowing electron transfer to standard fullerene acceptors. Bulk heterojunction type organic photodetectors are fabricated and the resulting device characteristics are analysed. The best performing photodetector is based on the polymer PTTBAI comprising thieno[3,2-b]thiophene as the electron-rich moiety. It has a superior light to dark current ratio, with a dark current density of 10−7 A cm−2, resulting in a (shot-noise limited) detectivity of 1012 Jones at −2 V bias within the spectral window of 600–1100 nm, exceeding the detectivity of conventional silicon CCD photodetectors in the near-infrared region (∼1011 Jones).

Graphical abstract: Near-infrared organic photodetectors based on bay-annulated indigo showing broadband absorption and high detectivities up to 1.1 μm

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Publication details

The article was received on 21 Aug 2018, accepted on 10 Oct 2018 and first published on 13 Oct 2018


Article type: Paper
DOI: 10.1039/C8TC04164D
Citation: J. Mater. Chem. C, 2018,6, 11645-11650
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    Near-infrared organic photodetectors based on bay-annulated indigo showing broadband absorption and high detectivities up to 1.1 μm

    F. Verstraeten, S. Gielen, P. Verstappen, J. Kesters, E. Georgitzikis, J. Raymakers, D. Cheyns, P. Malinowski, M. Daenen, L. Lutsen, K. Vandewal and W. Maes, J. Mater. Chem. C, 2018, 6, 11645
    DOI: 10.1039/C8TC04164D

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