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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications

SYSA 5: Poster Session SYSA

SYSA 5.29: Poster

Dienstag, 26. Februar 2008, 14:30–20:00, Poster A

Transparent Contacting Materials for Organic Solar Cells — •Jan Meiß, Moritz K. Riede, and Karl Leo — Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden

Organic solar cells are emerging as a possible inexpensive alternative to inorganic photovoltaics. A current cost issue of organic solar cells is the high price of indium tin oxide (ITO), the most commonly used transparent contacting material. We are exploring alternatives to replace the scarce and expensive indium. Promising candidates are ZnO:Al or the highly conductive polymer PEDOT:PSS.

Here, we present the first small-molecule organic solar cells employing only PEDOT:PSS as transparent anode. Both cells on glass and on flexible PET foil were made, using thermally evaporated ZnPc/C60 as donor-acceptor heterojunction and metal contacts as back electrode. Different methods to structure the PEDOT:PSS electrodes were investigated and are presented, e.g. by dip-coating in a solution of polystyrene in toluene or by using pre-patterned plastic foil.

Resulting prototype cells with open-circuit voltages of up to 0.48 V, currents of 5 mA/cm^2 and fill factors > 50% were obtained with efficiencies of up to 0.99% (on flexible plastic foil) and 0.7% (on glass) for non-optimized experimental cells.