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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 31: Organic semiconductors II

CPP 31.7: Vortrag

Donnerstag, 29. März 2012, 11:30–11:45, C 130

Magnetoresistive organic field-effect transistors based on donor/acceptor blends — •Thomas Reichert, Tobat P. I. Saragi, and Josef Salbeck — Macromolecular Chemistry and Molecular Materials, Department of Mathematics and Science and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, Heinrich Plett Strasse 40, D 34132 Kassel, Germany

Room temperature magnetoresistive organic field-effect devices operated at low magnetic fields (<100 mT) are presented. They consist of different coevaporated donor/acceptor blends, with a high probability for intermolecular charge-transfer states. No magnetic field-effect is observed in the devices of pristine compounds. In contrast, a significant magnetoresistance effect is obtained in the mixed systems. The sign of magnetoresistance can be tuned by varying the applied drain and gate voltages. The magnetoresistance values also depend on the composition of the donor- and acceptor-molecules. Our results contribute to the elucidation of the origin of magnetoresistance in organic field-effect transitors and open a way to magnetosensitive organic devices without ferromagnetic materials.