Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Transparent electrodes with very high conductivity and high transmittance in visible and near infrared region were produced by integration of conductive wires into precision fabrics, made of polymeric monofilaments. In addition, the fabrics were coated (filled) with a transparent flexible polymer barrier films or punctually adhered to transparent films or glass. The electrodes showed surface resistivity smaller than 1 §Ù/square and concomitant transmittance exceeding 80% (Fig.1)
When applied as a counter electrode in a dye sensitized solar cells, high efficiencies were achieved, proving the excellent functionality of this product. A free standing wire mesh system resulted in excellent DSC performances exceeding 9% power conversion efficiency under 30% sun illumination in 1 cm2test cells. Uniform fabric electrodes consisting of this mesh were fabricated and applied in large 17.5 cm2cells, with a high efficiency of 8.6 % under 23% sun illumination. Finally, a 100 cm2cell employing the optimized Sefar fabric electrode with an efficiency > 6% under 30% sun illumination was achieved.
Using these very open precision fabrics as electrodes for dye sensitized solar cells it was possible to replace the TCO (ITO) coated flexible substrates, which presently dominate this market. In the case of organic solar cells, results obtained from the first experiments showed similar efficiency like solar cells made on other transparent substrates, like ITO coated glass.
The right transparent coating composition, the optimum ratio between metalized and non-metalized fibers constituting the fabrics as well as more planar surface structure for OPV and perovskite solar cells have to be found in order to reduce costs while keeping the benefits.
Some examples of additional optoelectronic devices, fabricated on coated fabric electrodes will be presented at the conference as well.
White color represents polymer fibers, black color represents metallic fibers. Light blue color represents a polymer coating, dark blue color represents a transparent foil.
Tsao, H.N.; Liska, P.; Chabrecek, P.; Stefik, M.; Thüler, R.; Grätzel, M. Precision metal wire fabric electrodes for large area and highly efficient dye sensitized solar cell modules. (in submission). Chabrecek, P.; De Castro, F.A.; Nüesch, F.; Meier, H-P.; Rosenfelder, M. Substrate for an optoelectronic device. 2011, EP 2 347 449 A1. Kylberg, W.; de Castro, FA.; Chabrecek, P.; Sonderegger, U.; Nuesch, F.; Hany, R. ADVANCED MATERIALS 2011, Volume:23 Issue:8 Pages:1015-1019
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