Photovoltaic Devices: Highly Conductive PEDOT:PSS Electrode with Optimized Solvent and Thermal Post-Treatment for ITO-Free Organic Solar Cells (Adv. Funct. Mater. 6/2011)

Authors

  • Yong Hyun Kim,

    Corresponding author
    1. Dresdener Innovationszentrum für Energieeffizienz, Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany
    • Dresdener Innovationszentrum für Energieeffizienz, Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany.
    Search for more papers by this author
  • Christoph Sachse,

    1. Dresdener Innovationszentrum für Energieeffizienz, Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany
    Search for more papers by this author
  • Michael L. Machala,

    1. Dresdener Innovationszentrum für Energieeffizienz, Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany
    Search for more papers by this author
  • Christian May,

    1. Fraunhofer Institut für Photonische Mikrosysteme, Maria-Reiche Strasse 2, 01109 Dresden, Germany
    Search for more papers by this author
  • Lars Müller-Meskamp,

    Corresponding author
    1. Dresdener Innovationszentrum für Energieeffizienz, Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany
    • Dresdener Innovationszentrum für Energieeffizienz, Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany.
    Search for more papers by this author
  • Karl Leo

    1. Dresdener Innovationszentrum für Energieeffizienz, Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany
    2. Fraunhofer Institut für Photonische Mikrosysteme, Maria-Reiche Strasse 2, 01109 Dresden, Germany
    Search for more papers by this author

Abstract

Highly conductive poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) films as stand-alone electrodes for organic solar cells have been optimized using a solvent post-treatment method. The treated PEDOT:PSS films show enhanced conductivities up to 1418 S cm−1, accompanied by structural and chemical changes. The effect of the solvent treatment on PEDOT:PSS has been investigated in detail and is shown to cause a reduction of insulating PSS in the conductive polymer layer. Using these optimized electrodes, ITO-free, small molecule organic solar cells with a zinc phthalocyanine (ZnPc):fullerene C60 bulk heterojunction have been produced on glass and PET substrates. The system was further improved by pre-heating the PEDOT:PSS electrodes, which enhanced the power conversion efficiency to the values obtained for solar cells on ITO electrodes. The results show that optimized PEDOT:PSS with solvent and thermal post-treatment can be a very promising electrode material for highly efficient flexible ITO-free organic solar cells.

Ancillary