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HL: Fachverband Halbleiterphysik

HL 45: Joint Poster Session

HL 45.19: Poster

Dienstag, 15. März 2011, 18:00–21:00, P1

ITO-free inverted polymer-fullerene bulk-heterojunction solar cells with different contact configurations — •Sebastian Wilken, Holger Borchert, Elizabeth von Hauff, and Jürgen Parisi — University of Oldenburg, Department of Physics, Energy and Semiconductor Research Laboratory, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany

In order to replace the expensive indium-tin oxide (ITO), commonly used as transparent electrode in organic solar cells, we studied P3HT:PCBM bulk-heterojunction solar cells with an inverted layer sequence. Different concepts were used to obtain both a transparent and a highly conductive anode, e.g. ultra-thin gold layers (∼10 nm) or polymers like PEDOT:PSS in combination with metal grids. We performed transmittance and sheet resistance measurements for various layer thicknesses to acheive a compromise between high transmission in the absorption range of P3HT and good electrical conductivity. Furthermore the impact of electron-selective materials such as solution-processed ZnO nanoparticles on the cathode side was examined. Here we present the photovoltaic performance of the different inverted solar cell structures. The active area of the devices was relatively large, with an area of nearly 1 cm².