An efficient merocyanine/zinc phthalocyanine tandem solar cell |
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| Authors: | V. Steinmann T.E. Umbach M. Schädel J. Krumrain M.R. Lenze H. Bürckstümmer F. Würthner K. Meerholz |
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| Affiliation: | 1. Department of Chemistry, University of Cologne, Luxemburger Str. 116, 50939 Cologne, Germany;2. Institut für Organische Chemie and Röntgen Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany |
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| Abstract: | We present a merocyanine:C60/zinc phthalocyanine:C60 tandem solar cell, comprising two complementary absorbing bulk heterojunction subcells connected in series. High-efficiency devices were realized in a rather simple tandem setup, consisting of only three organic layers that were successively deposited in an ultrahigh-vacuum chamber. The optimized tandem solar cell features an efficiency of 4.5%, demonstrating a performance improvement by ca. 50% compared to the individual optimized single-junction solar cells. The experimental data are in excellent agreement with optical simulations, assuming an internal quantum efficiency near unity in the optimized tandem device. |
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| Keywords: | Organic solar cells Tandem cells Small molecules Merocyanines Vacuum-processing Thermal evaporation |
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