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Analysis of Charge Photogeneration as a Key Determinant of Photocurrent Density in Polymer: Fullerene Solar Cells

Authors

  • Tracey M. Clarke,

    1. Centre for Plastic Electronics, Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ (UK)
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  • Amy Ballantyne,

    1. Centre for Plastic Electronics, Department of Physics, Imperial College London, Exhibition Road, London SW7 2AZ (UK)
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  • Safa Shoaee,

    1. Centre for Plastic Electronics, Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ (UK)
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  • Ying W. Soon,

    1. Centre for Plastic Electronics, Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ (UK)
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  • Warren Duffy,

    1. Centre for Plastic Electronics, Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ (UK), Merck Chemicals, Chilworth Science Park, Southampton SO16 7QD (UK)
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  • Martin Heeney,

    1. Centre for Plastic Electronics, Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ (UK), Merck Chemicals, Chilworth Science Park, Southampton SO16 7QD (UK)
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  • Iain McCulloch,

    1. Centre for Plastic Electronics, Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ (UK), Merck Chemicals, Chilworth Science Park, Southampton SO16 7QD (UK)
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  • Jenny Nelson,

    1. Centre for Plastic Electronics, Department of Physics, Imperial College London, Exhibition Road, London SW7 2AZ (UK)
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  • James R. Durrant

    Corresponding author
    1. Centre for Plastic Electronics, Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ (UK)
    • Centre for Plastic Electronics, Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ (UK).
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Abstract

Charge Photogeneration: The correlation between the efficiency of photogeneration of dissociated polarons and photocurrent densities for organic solar cells based on polymer:fullerene blend films is investigated. Optical assays of polaron yield measured in films without electrodes show a remarkably clear correlation with short circuit density and quantum yield measured in complete devices. For the blend films studied herein, the primary determinant of photocurrent generation is the efficiency of dissociation of photogenerated charges away from the polymer/fullerene interface and the primary loss pathway is geminate recombination.

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