Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 28: Poster Session: Graphen; Transport properties; Transport in high magnetic fields / Quantum Hall effect; Metal-semiconductor hybrid systems

HL 28.23: Poster

Montag, 11. März 2013, 16:00–20:00, Poster A

Metal complexes and organic radicals as electronic components — •Karin Goß, Simon Seyfferle, Martin Dressel, and Lapo Bogani — 1. Physikalisches Institut, Universität Stuttgart

Using molecules as building blocks for electronic devices offers ample possibilities for new device functionalities due to a chemical tunability much higher than that of standard inorganic materials, and, at the same time, offers a decrease in the size of the electronic component down to the single-molecule level. Metal clusters with an organic shell are a very versatile playground since both the metallic ions as well as the organic ligands can be chemically tuned to fulfill a particular functionality. For example, metallic ions can induce magnetism in the system on a single-molecular basis and ligands can be tailored to increase the affinity for binding to metallic electrodes or other organic material. But also purely organic molecules containing no metallic centers can serve as an electronic component. We present our results on electronic devices based on magnetic materials of different kind and functionality. We show the conducting behaviour of several sample layouts, all of which contain a molecular material as the functional element, and we provide a correlation between the electronic behaviour and the pre-designed chemical functionality. In particular, organic radical molecules can be reversibly switched between two oxidation states by applying a bias voltage across a thin layer of molecular material. Some members of this family of molecules also offer spintronic applications, which can be probed by injecting and detecting spin-polarized electrons with ferromagnetic leads.