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Vera Steinmann, Nils M. Kronenberg, Martin R. Lenze, Steven M. Graf, Dirk Hertel, Klaus Meerholz, Hannah Bürckstümmer, Elena V. Tulyakova and Frank Würthner Simple, Highly Efficient Vacuum-Processed Bulk Heterojunction Solar Cells Based on Merocyanine Dyes Advanced Energy Materials 1

Article first published online: 22 AUG 2011 | DOI: 10.1002/aenm.201100283

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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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