Transient Absorption Spectroscopy Studies on Polythiophene–Fullerene Bulk Heterojunction Organic Blend Films Sensitized with a Low-Bandgap Polymer

Authors

  • Heiko Löslein,

    1. i-MEET (WW6), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, 91058 Erlangen, Germany
    2. Organic Semiconductor Center, University of St Andrews, St Andrews, Fife KY16 9SS, UK
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  • Tayebeh Ameri,

    Corresponding author
    1. i-MEET (WW6), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, 91058 Erlangen, Germany
    2. i-MEET (WW6), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, 91058 Erlangen, Germany
    • i-MEET (WW6), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, 91058 Erlangen, Germany.
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  • Gebhard J. Matt,

    1. i-MEET (WW6), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, 91058 Erlangen, Germany
    2. Johannes Kepler University Linz, Altenbergerstr. 69, A-4040 Linz, Austria
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  • Markus Koppe,

    1. Johannes Kepler University Linz, Altenbergerstr. 69, A-4040 Linz, Austria
    2. Konarka Austria GmbH, Altenbergerstrasse 69, A-4040 Linz, Austria
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  • Hans J. Egelhaaf,

    1. Konarka Austria GmbH, Altenbergerstrasse 69, A-4040 Linz, Austria
    2. Belectric OPV GmbH, Landgrabenstrasse 94, 90443 Nürnberg, Germany
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  • Anna Troeger,

    1. Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
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  • Vito Sgobba,

    1. Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
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  • Dirk M. Guldi,

    1. Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany
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  • Christoph J. Brabec

    1. i-MEET (WW6), Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 7, 91058 Erlangen, Germany
    2. Bavarian Center for Applied Energy Research (ZAE Bayern), Am Weichselgarten 7, 91058 Erlangen, Germany
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Abstract

Recently, the concept of near-infrared sensitization is successfully employed to increase the light harvesting in large-bandgap polymer-based solar cells. To gain deeper insights into the operation mechanism of ternary organic solar cells, a comprehensive understanding of charge transfer–charge transport in ternary blends is a necessity. Herein, P3HT:PCPDTBT:PCBM ternary blend films are investigated by transient absorption spectroscopy. Hole transfer from PCPDTBT-positive polarons to P3HT in the P3HT:PCPDTBT:PCBM 0.9:0.1:1 blend film can be visualized. This process evolves within 140 ps and is discussed with respect to the proposed charge-generation mechanisms.

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