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HL: Fachverband Halbleiterphysik

HL 92: Poster Session: Structure and transport in organic photovoltaics; Photovoltaics; Impurities/Amorphous semiconductors; New materials

HL 92.9: Poster

Donnerstag, 14. März 2013, 16:00–20:00, Poster A

Optimization of indium tin oxide-free semitransparent polymer-based solar cells — •Verena Wilkens¹, Antonio España Petatań¹, Sebastian Wilken¹, Kambulakwao Chakanga², Omid Madani Ghahfarokhi², Karsten von Maydell², Jürgen Parisi¹, and Holger Borchert¹ — ¹University of Oldenburg, Dept. of Physics, Energy and Semiconductor Research Laboratory, 26111 Oldenburg, Germany — ²Next Energy, EWE-Forschungszentrum für Energietechnologie e.V., 26129 Oldenburg, Germany

The absorption of conjugated polymers is usually limited to the visible range, which leads to lower photocurrents of polymer-based organic solar cells (OSCs), compared to established technologies based on inorganic semiconductors. On the other hand, such narrow absorption profiles enable the realization of semitransparent devices, which can be utilized in power-generating window applications. The most challenging issue for that purpose is the development of almost transparent contacts with sufficient electrical properties. Here, we present semitransparent OSCs based on poly(3-hexylthiophene) (P3HT) and phenyl-C₆₁-butyric acid methyl ester (PCBM), which are free from the expensive transparent conductor indium tin oxide (ITO). Instead of ITO, we report on the application of aluminum-doped zinc oxide (ZnO:Al), prepared by dc-magnetron sputtering. As hole contact, ultra-thin films (e.g. Ag or Au) with an adequate transparency in the required wavelength regime were used. We introduced additional interfacial layers like molybdenum oxide (MoO₃) and tungsten oxide (WO₃), in order to improve charge extraction and light incoupling.