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Effect of Polymer Crystallinity in P3HT:PCBM Solar Cells on Band Gap Trap States and Apparent Recombination Order

Authors

  • Donato Spoltore,

    Corresponding author
    1. Institute for Materials Research (IMO), Universiteit Hasselt, Division IMOMEC, IMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
    • Institute for Materials Research (IMO), Universiteit Hasselt, Division IMOMEC, IMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium.
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  • Wibren D. Oosterbaan,

    1. Institute for Materials Research (IMO), Universiteit Hasselt, Division IMOMEC, IMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
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  • Samira Khelifi,

    1. Department of Electronics and Information Systems (ELIS), University of Gent, Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium
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  • John N. Clifford,

    1. Institute of Chemical Research of Catalonia (ICIQ), Avda. Països Catalans 16, 43007 Tarragona, Spain
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  • Aurelien Viterisi,

    1. Institute of Chemical Research of Catalonia (ICIQ), Avda. Països Catalans 16, 43007 Tarragona, Spain
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  • Emilio Palomares,

    1. Institute of Chemical Research of Catalonia (ICIQ), Avda. Països Catalans 16, 43007 Tarragona, Spain
    2. Institut Català de Recerca I Estudis Avançats (ICREA), Avda. Lluís Companys 23, 80810 Barcelona, Spain
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  • Marc Burgelman,

    1. Department of Electronics and Information Systems (ELIS), University of Gent, Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium
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  • Laurence Lutsen,

    1. Institute for Materials Research (IMO), Universiteit Hasselt, Division IMOMEC, IMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
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  • Dirk Vanderzande,

    1. Institute for Materials Research (IMO), Universiteit Hasselt, Division IMOMEC, IMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
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  • Jean Manca

    1. Institute for Materials Research (IMO), Universiteit Hasselt, Division IMOMEC, IMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
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Abstract

The non-geminate recombination of charge carriers in polymer-fullerene solar cells has been modeled in the last few years with a trap-assisted recombination model, which states that the apparent recombination order depends on the concentration of trapped charges tailing into the band gap. Higher concentrations of trapped charges lead to higher apparent recombination orders. In this work, the mass fraction f of highly crystalline nanofibrillar P3HT to the total P3HT content in P3HT:PCBM solar cells is consistently varied, controlling the temperature of a nanofibers-P3HT casting dispersion. A systematic study of the apparent recombination order, measured with a transient photovoltage technique, as a function of f is presented. A correlation is shown between the apparent recombination order, the P3HT crystallinity, and the trap concentration in the band gap measured with an admittance spectroscopy technique.

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