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Introducing a new triazoloquinoxaline-based fluorene copolymer for organic photovoltaics: Synthesis, characterization, and photovoltaic properties

Authors

  • Derya Baran,

    Corresponding author
    1. Institute of Materials for Electronics and Energy Technology, Department of Materials Science and Engineering, Friedrich-Alexander-University Erlangen-Nurnberg, Martensstrasse 7, Erlangen 91058, Germany
    • Institute of Materials for Electronics and Energy Technology, Department of Materials Science and Engineering, Friedrich-Alexander-University Erlangen-Nurnberg, Martensstrasse 7, Erlangen 91058, Germany
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  • Felix M. Pasker,

    1. Kekulé-Insitute of Organic Chemistry and Biochemistry, Rheinische Friedrich-Wilhems-University Bonn, Gerhard-Domagk-Str.1, Bonn 53121, Germany
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  • Stephan Le Blanc,

    1. Kekulé-Insitute of Organic Chemistry and Biochemistry, Rheinische Friedrich-Wilhems-University Bonn, Gerhard-Domagk-Str.1, Bonn 53121, Germany
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  • Gregor Schnakenburg,

    1. Insitute of Inorganic Chemistry, Rheinische Friedrich-Wilhems-University Bonn, Gerhard-Domagk-Str.1, Bonn 53121, Germany
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  • Tayebeh Ameri,

    1. Institute of Materials for Electronics and Energy Technology, Department of Materials Science and Engineering, Friedrich-Alexander-University Erlangen-Nurnberg, Martensstrasse 7, Erlangen 91058, Germany
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  • Sigurd Höger,

    Corresponding author
    1. Kekulé-Insitute of Organic Chemistry and Biochemistry, Rheinische Friedrich-Wilhems-University Bonn, Gerhard-Domagk-Str.1, Bonn 53121, Germany
    • Kekulé-Insitute of Organic Chemistry and Biochemistry, Rheinische Friedrich-Wilhems-University Bonn, Gerhard-Domagk-Str.1, Bonn 53121, Germany
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  • Christoph J. Brabec

    1. Institute of Materials for Electronics and Energy Technology, Department of Materials Science and Engineering, Friedrich-Alexander-University Erlangen-Nurnberg, Martensstrasse 7, Erlangen 91058, Germany
    2. Bavarian Center for Applied Energy Research (ZAE Bayern), Am Weichselgarten 7, Erlangen 91058, Germany
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Abstract

A new donor-acceptor copolymer consisting of triazoloquinoxaline and 9,9-dialkylfluorene units on the main chain has been synthesized, characterized and evaluated as donor material in bulk heterojunction solar cells using PC61BM as an acceptor. The resulting polymer PTQF showed good thermal stability and solubility in common organic solvents. Cyclic Voltammetry measurements showed that the PTQF has HOMO–LUMO energy levels of −5.13 and −3.62 eV, respectively. DFT calculations revealed that the HOMO is delocalized all over the thiophene and fluorene units and the LUMO is localized mainly on the triazole and pyrazine units. PTQF absorbs broadly in the visible region and exhibits a bandgap of 1.4 eV. Photovoltaic devices exhibited 1.7% efficiency for 1:2 PTQF:PC61BM blend ratio using Ca/Ag electrodes. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013

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