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Reduced Coulomb interaction in organic solar cells by the introduction of inorganic high-k nanostructured materials

Authors

  • Miriam Engel,

    1. Institute for Nanostructures and Technology (NST), Faculty of Engineering, University of Duisburg-Essen and CENIDE – Center for Nanointegration Duisburg-Essen, 47057 Duisburg, Germany
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  • David Schaefer,

    1. General and Theoretical Electrical Engineering (ATE), Faculty of Engineering, University of Duisburg-Essen and CENIDE – Center for Nanointegration Duisburg-Essen, 47057 Duisburg, Germany
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  • Daniel Erni,

    1. General and Theoretical Electrical Engineering (ATE), Faculty of Engineering, University of Duisburg-Essen and CENIDE – Center for Nanointegration Duisburg-Essen, 47057 Duisburg, Germany
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  • Niels Benson,

    Corresponding author
    • Institute for Nanostructures and Technology (NST), Faculty of Engineering, University of Duisburg-Essen and CENIDE – Center for Nanointegration Duisburg-Essen, 47057 Duisburg, Germany
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  • Roland Schmechel

    1. Institute for Nanostructures and Technology (NST), Faculty of Engineering, University of Duisburg-Essen and CENIDE – Center for Nanointegration Duisburg-Essen, 47057 Duisburg, Germany
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Corresponding author: e-mail niels.benson@uni-due.de, Phone: +49 (0)203 379 1058, Fax: +49 (0)203 379 3268

Abstract

In this paper a concept is introduced, which allows for reduced Coulomb interaction in organic solar cells and as such for enhanced power conversion efficiencies. The concept is based on the introduction of electrically insulating, nanostructured high-k materials into the organic matrix, which do not contribute to the charge transport; however, enhance the effective permittivity of the organic active layer and thereby reduce the Coulomb interaction. Using an analytical model, it is demonstrated that even at a distance of 20 nm to the organic/inorganic interface of the nanostructure, the Coulomb interaction in the organic semiconductor can be reduced by more than 15%. The concept is implemented using P3HT:PCBM solar cells with integrated high-k nanoparticles (strontium titanate). It could be demonstrated that in comparison to a reference cell without integrated nanoparticles, the power conversion efficiencies is improved by ∼17%.

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