Overcoming Geminate Recombination and Enhancing Extraction in Solution-Processed Small Molecule Solar Cells

Authors

  • Christopher M. Proctor,

    1. Center for Polymers and Organic Solids, University of California Santa Barbara, Santa Barbara, CA, USA
    2. Materials Department, University of California Santa Barbara, Santa Barbara, CA, USA
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  • Steve Albrecht,

    1. University of Potsdam, Institute of Physics and Astronomy, Potsdam, Germany
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  • Martijn Kuik,

    1. Center for Polymers and Organic Solids, University of California Santa Barbara, Santa Barbara, CA, USA
    2. Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA, USA
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  • Dieter Neher,

    1. University of Potsdam, Institute of Physics and Astronomy, Potsdam, Germany
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  • Thuc-Quyen Nguyen

    Corresponding author
    1. Center for Polymers and Organic Solids, University of California Santa Barbara, Santa Barbara, CA, USA
    2. Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA, USA
    3. Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
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Abstract

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The effects of processing conditions on charge transport and voltage dependent recombination losses in one of the most efficient solution-processed small molecule solar cell systems reported to date are studied. With careful control of the blend film morphology, geminate recombination (GR) can be completely overcome while reducing bimolecular recombination (BMR) to allow for efficient generation and collection of photogenerated charge carriers. These results highlight that a field-dependent generation mechanism is not necessarily an inherent molecular property.

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