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Fused structures in the polymer backbone to investigate the photovoltaic and electrochromic properties of donor–acceptor-type conjugated polymers

Authors

  • Sevki Can Cevher,

    1. Department of Chemistry, Middle East Technical University, Ankara 06800, Turkey
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  • Naime Akbasoglu Unlu,

    1. Department of Chemistry, Middle East Technical University, Ankara 06800, Turkey
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  • Ali Can Ozelcaglayan,

    1. Department of Chemistry, Middle East Technical University, Ankara 06800, Turkey
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  • Dogukan Hazar Apaydin,

    1. Department of Polymer Science and Technology, Ankara 06800, Turkey
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  • Yasemin Arslan Udum,

    1. Institute of Science and Technology, Department of Advanced Technologies, Gazi University, Ankara 06570, Turkey
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  • Levent Toppare,

    1. Department of Chemistry, Middle East Technical University, Ankara 06800, Turkey
    2. Department of Polymer Science and Technology, Ankara 06800, Turkey
    3. Department of Biotechnology, Middle East Technical University, Ankara 06800, Turkey
    4. The Center of Solar Energy Research and Applications (GUNAM), Middle East Technical University, Ankara 06800, Turkey
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  • Ali Cirpan

    Corresponding author
    1. Department of Chemistry, Middle East Technical University, Ankara 06800, Turkey
    2. Department of Polymer Science and Technology, Ankara 06800, Turkey
    3. The Center of Solar Energy Research and Applications (GUNAM), Middle East Technical University, Ankara 06800, Turkey
    4. Department of Micro and Nanotechnology, Middle East Technical University, Ankara 06800, Turkey
    • Department of Chemistry, Middle East Technical University, Ankara 06800, Turkey
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Abstract

In this study, two new benzotriazole (BTz) and dithienothiophene (DTT) containing conjugated polymers were synthesized. After successful characterizations of the monomers by proton-nuclear magnetic resonance (1H NMR) and carbon-NMR (13C NMR) techniques, poly(4-(dithieno[3, 2-b:2′,3′-d]thiophen-2-yl)-2-(2-octyldodecyl)-2H-benzo[d][1,2,3] triazole) P1 and poly(4-(5-(dithieno[3,2-b:2′,3′-d]thiophen-2-yl)thiophen-2-yl)-2-(2-octyldodecyl)-7-(thiophen-2-yl)-2H-benzo[d][1,2,3]triazole) P2 were synthesized via a typical Stille coupling. Electrochemical and spectroelectrochemical studies showed that both polymers can be multipurpose materials and used in electrochromic and photovoltaic applications. Reported study indicated that incorporation of DTT into the structure leads to fast switching times compared with BTz-based polymers and competent percentage transmittance in the near-infrared region. Multichromism is important in the context of low-cost flexible display device technology and both polymers are ambipolar and processable as well as multichromic. Throughout the preliminary photovoltaic studies, the best performances of photovoltaic devices were found as Voc = 0.49 V, Jsc = 0.83 mA/cm2, fill factor (FF) = 34.4%, and power conversion efficiency (PCE) = 0.14% for P1, and as Voc = 0.35 V, Jsc = 1.57 mA/cm2, FF = 38.2%, and PCE = 0.21% for P2. © 2013 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013

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