Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 17: Poster Session I (Nanostructures at Surfaces; Metal Substrates: Epitaxy and Growth; Methods: Scanning Probe Techniques; Phase Transitions)
O 17.37: Poster
Montag, 26. März 2007, 17:30–20:30, Poster C
Photoelectron microscopy on inhomogeneously alkali adsorbed transition-metal dichalcogenides — •Dirk Rahn1, Hans Starnberg2, Jens Buck1, Sönke Harm1, Kai Rossnagel1, and Lutz Kipp1 — 1Institut für Experimentelle und Angewandte Physik, Universität Kiel, D-24098 Kiel, Germany — 2Department of Physics, Göteborg University and Chalmers University of Technology, SE-41296 Göteborg, Sweden
The behavior of alkali metals deposited on transition-metal dichalcogenides (TMDC) is of great interest in basic research and in applications, for example in battery development.
The question in which way the alkali metal adsorbs on the TMDC is not finally answered. On the one hand, a certain amount of alkali atoms intercalates into the van der Waals gaps of the TMDC, while a small amount remains at the surface. On the other hand, the formation of nano-structures in the uppermost layer is observed. To get better insight into the differences between the two scenarios and to determine in particular the diffusion length of the alkali atoms on the TMDC surface, we have prepared samples with two different concentration domains. We have investigated such a sample with the photoelectron microscope at BL 31 at the Max-lab in Lund (Sweden) with a spacial resolution of 4 µm. Photoelectron images of the sample surface at constant kinetic energies and photoelectron spectra with different alkali metal concentrations for TaS2 and TaSe2 will be presented.
This work is supported by the DFG Forschergruppe FOR 353.