On the Importance of Morphology Control in Polymer Solar Cells

Authors

  • Svetlana van Bavel,

    1. Dutch Polymer Institute, P.O. Box 902, 5600 AX Eindhoven, The Netherlands
    2. Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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  • Sjoerd Veenstra,

    1. Dutch Polymer Institute, P.O. Box 902, 5600 AX Eindhoven, The Netherlands
    2. Energy Research Centre of The Netherlands (ECN), P.O. Box 1, 1755 ZG Petten, The Netherlands
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  • Joachim Loos

    Corresponding author
    1. Dutch Polymer Institute, P.O. Box 902, 5600 AX Eindhoven, The Netherlands
    2. Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
    3. Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, Scotland, UK
    • Dutch Polymer Institute, P.O. Box 902, 5600 AX Eindhoven, The Netherlands.
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Abstract

Nanostructured polymer-based solar cells (PSCs) have emerged as a promising low-cost alternative to conventional inorganic photovoltaic devices and are now a subject of intensive research both in academia and industry. For PSCs to become practical efficient devices, several issues should still be addressed, including further understanding of their operation and stability, which in turn are largely determined by the morphological organisation in the photoactive layer. The latter is typically a few hundred nanometres thick film and is a blend composed of two materials: the bulk heterojunction consisting of the electron donor and the electron acceptor. The main requirements for the morphology of efficient photoactive layers are nanoscale phase segregation for a high donor/acceptor interface area and hence efficient exciton dissociation, short and continuous percolation pathways of both components leading through the layer thickness to the corresponding electrodes for efficient charge transport and collection, and high crystallinity of both donor and acceptor materials for high charge mobility. In this paper, we review recent progress of our understanding on how the efficiency of a bulk heterojunction PSC largely depends on the local nanoscale volume organisation of the photoactive layer.

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