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Quantifying Bimolecular Recombination Losses in Organic Bulk Heterojunction Solar Cells

Authors

  • L. Jan Anton Koster,

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    1. Molecular Materials and Nanosystems, Eindhoven University of Technology, PO BOX 513, 5600 MB Eindhoven, the Netherlands
    2. Molecular Electronics, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, the Netherlands
    • Molecular Materials and Nanosystems, Eindhoven University of Technology, PO BOX 513, 5600 MB Eindhoven, the Netherlands.
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  • Martijn Kemerink,

    1. Molecular Materials and Nanosystems, Eindhoven University of Technology, PO BOX 513, 5600 MB Eindhoven, the Netherlands
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  • Martijn M. Wienk,

    1. Molecular Materials and Nanosystems, Eindhoven University of Technology, PO BOX 513, 5600 MB Eindhoven, the Netherlands
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  • Klará Maturová,

    1. Molecular Materials and Nanosystems, Eindhoven University of Technology, PO BOX 513, 5600 MB Eindhoven, the Netherlands
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  • René A. J. Janssen

    1. Molecular Materials and Nanosystems, Eindhoven University of Technology, PO BOX 513, 5600 MB Eindhoven, the Netherlands
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Abstract

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We present a new experimental technique that affords direct quantification of the fraction of charge carriers lost in poly(3-hexylthiophene):fullerene solar cells by bimolecular recombination. Depending on annealing conditions up to 17% of carriers recombine bimolecularly under solar illumination. We explain our findings with a closed analytical expression for the photocurrent generated by an organic solar cell.

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