Regensburg 2010 – scientific programme
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DS: Fachverband Dünne Schichten
DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,
DS 29.55: Poster
Wednesday, March 24, 2010, 15:00–17:30, Poster A
Electronic excitations of potassium doped MnPc — •Benjamin Mahns, Friedrich Roth, Andreas König, Roberto Kraus, Mandy Grobosch, Sven Partzsch, Martin Knupfer, and Bernd Büchner — IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany
We have investigated the evolution of the electronic excitations of Manganese Phthalocyanine (MnPc), an archetype magnetic molecule, upon potassium doping using Electron Energy-Loss Spectroscopy. Thin films of MnPc have been grown by thermal evaporation on orientated KBr (100) crystals under Ultra High Vacuum conditions. A characterization of the crystal structure using electron diffraction and optical spectroscopy shows that we are mainly dealing with the so called α-polymorph of MnPc. We also could identify stable phases of K2MnPc and K4MnPc. Potassium doping, i.e. the addition of electrons to the MnPc molecules, causes significant changes in the electronic excitations involving π-π* transitions of the pthalocyanine ligand as well as the Mn 3d orbitals.