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Proceedings Paper

Organic solar cells with inverted layer sequence incorporating optical spacers: simulation and experiment
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Paper Abstract

In this paper we present detailed optical simulations of organic bulk-heterojunction solar cells built with inverted layer sequence as compared to the commonly used setup which is based on indium tin oxide (ITO) covered glass or plastic substrates and where the metal electrode is evaporated on top of the active absorber blend. The inverted setup may have production related advantages over the conventional setup, as the metal electrode is first evaporated onto the substrate and afterwards only wet chemical processes are needed. Additionally ITO can be replaced with a suited module concept. The effects of light trapping with an optical spacer, namely a transparent conductive layer between the absorber and the metallic electrode are investigated for the inverted setup. The results show that the insertion of an optical spacer does not increase the maximal obtainable short circuit current density and is only beneficial if a decrease of film thickness of the active absorber results in a higher internal quantum efficiency, open circuit voltage or fill factor. In the experimental section we show that the inversion of the layer sequence can be realised without any loss in device efficiency as compared to devices with the conventional layer sequence.

Paper Details

Date Published: 12 May 2006
PDF: 6 pages
Proc. SPIE 6197, Photonics for Solar Energy Systems, 61970G (12 May 2006); doi: 10.1117/12.662530
Show Author Affiliations
Birger Zimmermann, Freiburg Materials Research Ctr. (Germany)
Markus Glatthaar, Freiburg Materials Research Ctr. (Germany)
Michael Niggemann, Freiburg Materials Research Ctr. (Germany)
Fraunhofer Institute for Solar Energy Systems ISE (Germany)
Moritz Kilian Riede, Fraunhofer Institute for Solar Energy Systems ISE (Germany)
Tobias Ziegler, Fraunhofer Institute for Solar Energy Systems ISE (Germany)
Andreas Gombert, Fraunhofer Institute for Solar Energy Systems ISE (Germany)


Published in SPIE Proceedings Vol. 6197:
Photonics for Solar Energy Systems
Andreas Gombert, Editor(s)

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