Berlin 2012 – scientific programme
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AKE: Arbeitskreis Energie
AKE 13: Erneuerbare Energie: Solarenergie und Integration
AKE 13.1: Invited Talk
Wednesday, March 28, 2012, 16:45–17:15, EW 201
Dye-based solar cells - recent advances and specific results for merocyanine dyes — Klaus Meerholz1, •Vera Steinmann1, Nils Kronenberg1, Martin Lenze1, Hannah Buerckstuemmer2, and Frank Wuerthner2 — 1University of Cologne — 2University of Wuerzburg
Organic and dye-based solar cell R&D is rapidly progressing. The talk will give an overview of the status of dye-based solar cell R&D and address in particular merocyanine dyes as electron donor compounds in small-molecule bulk-heterojunction solar cells. Most simple-structured merocyanines have the major advantage of being soluble as well as ther-mally stable and thus sublimable, which leads to more flexibility in the device processing. Recently, we presented a direct comparison of highly efficient solution- and vacuum-processed bulk heterojunction solar cells based on merocyanines with a simple device stack consisting of only three organic layers. In this study, the most efficient devices exhibited an efficiency of 4.9%. Following this, we succeeded in optimizing the vacuum-processed merocyanine solar cells while maintaining the same simple layer stack. Here, we reported efficiencies up to 6.1%. Due to their remarkably high and easily tunable absorption, merocyanine dyes are also promising candidates for tandem structures. Very recently, we successfully implemented merocyanine dyes in tandem-cell devices. High efficiencies up to 4.7% were achieved by simply connecting two identical single-cells in series. These devices also displayed remarkably high open-circuit voltages beyond 2V. The prospects for applications will be discussed. (Der Vortrag wird auf Deutsch mit englischsprachigen Folien gehalten)