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High yield fabrication of vertical interdigital electrodes with sub micrometer distance and their application in an organic photovoltaic device

 
: Stelzl, F.; Schulz-Gericke, J.; Niggemann, M.; Würfel, U.

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Organic Electronics 14 (2013), No.2, pp.535-541
ISSN: 1566-1199
Bundesministerium für Bildung und Forschung BMBF
16SV3738
Deutsche Forschungsgemeinschaft DFG
SPP 1355;
English
Journal Article
Fraunhofer ISE ()
Solarzellen - Entwicklung und Charakterisierung; Farbstoff; Organische und Neuartige Solarzellen; Alternative Photovoltaik-Technologien; Organische Solarzellen; Farbstoff- und Organische Solarzellen; Organic; cells; Nanostructured; Vertical; Electrodes

Abstract
This work reports on a new method to fabricate vertical, interdigital electrodes of different materials with sub micrometer distance. The electrodes are deposited by thermal evaporation on a micro replicated surface relief grating structure with high aspect ratio utilizing the shadowing effect of the structures. The optimized process presented here leads to a high yield in separated electrodes on micro replicated samples and tolerates topographical defects in them. As one of many potential applications, we demonstrate the functionality in organic solar cells (OSCs) composed of poly (3-hexylthiophene) (P3HT) blended with C-61-butyric acid methyl ester (PCBM). Using approx. 2500 electrode pairs connected in parallel a solar power conversion efficiency of 0.5% was achieved. This is a tenfold increase compared to previously reported values of OSCs on this setup, which is attributed to the improved processing scheme of the nanoelectrodes. Optical simulations were performed to evaluate the 2D-absorption profile and calculate the theoretical limit for the short circuit current density in these devices. The results indicate that the majority of the nanoelectrodes are intact.

: http://publica.fraunhofer.de/documents/N-234364.html