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Efficient Polymer Solar Cells on Opaque Substrates with a Laminated PEDOT:PSS Top Electrode

Authors

  • Dhritiman Gupta,

    1. Materials innovation institute (M2i), 2600 GA, Delft, Netherlands
    2. Molecular Materials and Nanosystems, Eindhoven University of Technology, 5600 MB Eindhoven, Netherlands
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  • Martijn M. Wienk,

    1. Molecular Materials and Nanosystems, Eindhoven University of Technology, 5600 MB Eindhoven, Netherlands
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  • René A. J. Janssen

    Corresponding author
    1. Molecular Materials and Nanosystems, Eindhoven University of Technology, 5600 MB Eindhoven, Netherlands
    • Molecular Materials and Nanosystems, Eindhoven University of Technology, 5600 MB Eindhoven, Netherlands.
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Abstract

Solution processed polymer:fullerene solar cells on opaque substrates have been fabricated in conventional and inverted device configurations. Opaque substrates, such as insulated steel and metal covered glass, require a transparent conducting top electrode. We demonstrate that a high conducting (900 S cm−1) PEDOT:PSS layer, deposited by a stamp-transfer lamination technique using a PDMS stamp, in combination with an Ag grid electrode provides a proficient and versatile transparent top contact. Lamination of large size PEDOT:PSS films has been achieved on variety of surfaces resulting in ITO-free solar cells. Power conversion efficiencies of 2.1% and 3.1% have been achieved for P3HT:PCBM layers in inverted and conventional polarity configurations, respectively. The power conversion efficiency is similar to conventional glass/ITO-based solar cells. The high fill factor (65%) and the unaffected open-circuit voltage that are consistently obtained in thick active layer inverted geometry devices, demonstrate that the laminated PEDOT:PSS top electrodes provide no significant potential or resistive losses.

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