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DS: Fachverband Dünne Schichten

DS 4: Magnetic / Organic Interfaces, Spins in Organics and Molecular Magnetism (jointly with MA)

DS 4.7: Vortrag

Montag, 31. März 2014, 16:45–17:00, CHE 91

Tailoring the energy level alignment at the Co/Alq₃ interface by controlled cobalt oxidation — •Norman Haag, Sabine Steil, Nicolas Großmann, Roman Fetzer, Mirko Cinchetti, and Martin Aeschlimann — Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany

We have studied the influence of oxygen exposure at the prototypical interface between cobalt and the organic semiconductor tris(8-hydroxyquinoline)aluminum (III) (Alq₃) by photoemission spectroscopy. We find that oxidation of the cobalt leads to a gradual suppression of hybrid interface states, to a progressive change in the work function and to a continuous energetic shift of the molecular orbitals towards higher binding energies. Based on these observations, we propose controlled oxidation of the ferromagnetic electrode as an easy and effective possibility to tune the performance of organic spintronics devices. Besides this method yields insight into possible origin of the interfacial dipole.