Simple,Highly Efficient Vacuum‐Processed Bulk Heterojunction Solar Cells Based on Merocyanine Dyes |
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Authors: | Vera Steinmann Nils M Kronenberg Martin R Lenze Steven M Graf Dirk Hertel Klaus Meerholz Hannah Bürckstümmer Elena V Tulyakova Frank Würthner |
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Institution: | 1. Department für Chemie, Universit?t K?ln, Luxemburger Stra?e 116, 50939 K?ln, Germany;2. Institut für Organische Chemie and R?ntgen Research Center for Complex Material Systems, Universit?t Würzburg, Am Hubland, 97074 Würzburg, Germany |
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Abstract: | In order to be competitive on the energy market, organic solar cells with higher efficiency are needed. To date, polymer solar cells have retained the lead with efficiencies of up to 8%. However, research on small molecule solar cells has been catching up throughout recent years and is showing similar efficiencies, however, only for more sophisticated multilayer device configurations. In this work, a simple, highly efficient, vacuum‐processed small molecule solar cell based on merocyanine dyes – traditional colorants that can easily be mass‐produced and purified – is presented. In the past, merocyanines have been successfully introduced in solution‐processed as well as vacuum‐processed devices, demonstrating efficiencies up to 4.9%. Here, further optimization of devices is achieved while keeping the same simple layer stack, ultimately leading to efficiencies beyond the 6% mark. In addition, physical properties such as the charge carrier transport and the cell performance under various light intensities are addressed. |
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Keywords: | bulk heterojunctions merocyanines organic solar cells small molecules vacuum processing |
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