Regensburg 2010 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 27: Poster: Organic Electronics and Photovoltaics

CPP 27.20: Poster

Wednesday, March 24, 2010, 17:30–19:00, Poster C

Organic magnetoresistance effect in unipolar and bipolar devices of conjugated polymers — •Thomas Manicke, Frank Jaiser, Sergey Bagnich, and Dieter Neher — Institut für Physik und Astronomie, Universität Potsdam, Potsdam, Deutschland

For the last few years, several origins of the organic magnetoresistance (OMaR) effect have been discussed. There are three main models to describe this effect, namely the polaron pair, bipolaron and excitonic model. The bipolaron model is mutually exclusive to the other two models and predicts an OMaR effect also for unipolar currents.

We present the results of measurements of the OMaR in unipolar and bipolar devices. Experiments were performed both on a hole-conducting polymer (MEH-PPV) and an electron-conducting polymer (F8BT). We also tested the influence of the cathode material in electron-only devices on the OMaR. The results of these experiments suggest that the bipolaron model is not suited to explain this intriguing effect consistently for all device configurations.