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Sara Trost, Kirill Zilberberg, Andreas Behrendt, Andreas Polywka, Patrick Görrn, Philip Reckers, Julia Maibach, Thomas Mayer and Thomas Riedl Overcoming the “Light-Soaking” Issue in Inverted Organic Solar Cells by the Use of Al:ZnO Electron Extraction Layers Advanced Energy Materials 3

Version of Record online: 28 JUN 2013 | DOI: 10.1002/aenm.201300402

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Organic solar cells (OSCs) using TiOx or ZnO as electron extraction layers typically require exposure to UV light for improved device characteristics – known as the socalled “light-soaking” issue. In contrast, OSCs using aluminum-doped ZnO (AZO) show well-behaved characteristics even without UV illumination. An electron extraction barrier for the TiOx/fullerene case and facilitated electron extraction for the AZO/fullerene interface is evidenced. These results are of general relevance for OSCs using substrates with limited UV transmission, UV blocking filters, or UV to VIS down-conversion concepts.

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