Get access
Advertisement

Flexible Organic Photovoltaic Cells with In Situ Nonthermal Photoreduction of Spin-Coated Graphene Oxide Electrodes

Authors

  • Emmanuel Kymakis,

    Corresponding author
    1. Center of Materials Technology and Photonics & Electrical Engineering Department, Technological Educational Institute (TEI) of Crete, Heraklion 71004 Crete, Greece
    • Center of Materials Technology and Photonics & Electrical Engineering Department, Technological Educational Institute (TEI) of Crete, Heraklion 71004 Crete, Greece
    Search for more papers by this author
  • Kyriaki Savva,

    1. Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), Heraklion, 71110 Crete, Greece
    2. Department of Physics, University of Crete, Heraklion, 71003 Crete, Greece
    Search for more papers by this author
  • Minas M. Stylianakis,

    1. Center of Materials Technology and Photonics & Electrical Engineering Department, Technological Educational Institute (TEI) of Crete, Heraklion 71004 Crete, Greece
    2. Department of Chemistry, University of Crete, Heraklion, 71003 Crete, Greece
    Search for more papers by this author
  • Costas Fotakis,

    1. Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), Heraklion, 71110 Crete, Greece
    2. Department of Physics, University of Crete, Heraklion, 71003 Crete, Greece
    Search for more papers by this author
  • Emmanuel Stratakis

    Corresponding author
    1. Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), Heraklion, 71110 Crete, Greece
    2. Department of Materials Science and Technology, University of Crete, Heraklion, 71003 Crete, Greece
    • Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), Heraklion, 71110 Crete, Greece.
    Search for more papers by this author

Abstract

The first reduction methodology, compatible with flexible, temperature-sensitive substrates, for the production of reduced spin-coated graphene oxide (GO) electrodes is reported. It is based on the use of a laser beam for the in situ, non-thermal, reduction of spin-coated GO films on flexible substrates over a large area. The photoreduction process is one-step, facile, and is rapidly carried out at room temperature in air without affecting the integrity of the graphene lattice or the flexibility of the underlying substrate. Conductive graphene films with a sheet resistance of as low as 700 Ω sq−1 and transmittance of 44% can be obtained, much higher than can be achieved for flexible layers reduced by chemical means. As a proof of concept of our technique, laser-reduced GO (LrGO) films are utilized as transparent electrodes in flexible, bulk heterojunction, organic photovoltaic (OPV) devices, replacing the traditional ITO. The devices displayed a power-conversion efficiency of 1.1%, which is the highest reported so far for OPV device incorporating reduced GO as the transparent electrode. The in situ non-thermal photoreduction of spin-coated GO films creates a new way to produce flexible functional graphene electrodes for a variety of electronic applications in a process that carries substantial promise for industrial implementation.

Get access to the full text of this article

Ancillary