Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 62: Poster II: Photovoltaics and Organic Semiconductors

HL 62.14: Poster

Thursday, March 25, 2010, 18:00–20:00, Poster D2

The effect of a cathode interlayer on the performance of polymer-fullerene bulk heterojunction solar cells — •Antonietta De Sio, Elizabeth von Hauff, and Jürgen Parisi — Energy and Semiconductor Research Laboratory, Institute of Physics, Carl von Ossietzky Universität Oldenburg, 26111 Oldenburg, Germany

We report on the impact of different cathode configurations on the performances of polymer-fullerene photovoltaic devices. The operation of the standard bulk heterojunction solar cell structure, in which the active layer consists of a blend of poly-3-hexylthiophene (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) 1:1 in weight ratio and the metal cathode is a 150nm thick Al layer, was first recorded as the reference. The electrical behavior of the devices upon inserting an interlayer between the organic active layer and the metal cathode was investigated. We also explored the effect of different kinds of interlayers on device performance, i.e. conductive materials like Ca and Mg, as well as insulating materials such as LiF. The effect of the interlayer is reflected in the solar cell parameters, in particular on the open circuit voltage.