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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications

SYSA 5: Poster Session SYSA

SYSA 5.30: Poster

Tuesday, February 26, 2008, 14:30–20:00, Poster A

Photo and electric-field induced absorption in organic materials for solar cell use — •Martin Knipper, Janet Neerken, and Jürgen Parisi — Energy and Semiconductor Research Laboratory, Department of Physics, University of Oldenburg, 26111 Oldenburg

Photo induced absorption (PIA) measurements are done at poly[2-metoxy-5-(3-,7-dimethyloctyloxy)-p-phenylene vinylene (MDMO-PPV) and at MDMO-PPV blended with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). This material combination is used for organic solar cells. The results from this optical measurement show us a charge transfer in the blended material. The aim of the new work is to do the absorption measurement electric-field induced. Therefore we sandwich the absorber layer between a transparent indium tin oxide (ITO) front electrode covered with a polymer buffer layer (PEDOT:PSS) and an aluminum back electrode. The aluminum electrode is semitransparent for this experiment. The electric-field induced absorption measurements show us signals at characteristic energies. From the peaks of the signal we can draw conclusions about absorption and charge transfer in the active layer of the organic solar cell in a real solar cell structure.