Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.76: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Electron Spectroscopy of Organic Heterointerfaces: SnPc/PTCDA/Ag(111) — •Michael Greif1, Marc Häming1, Michael Wießner1, Achim Schöll1, and Friedrich Reinert1,2 — 1Universität Würzburg, Experimentelle Physik VII, D-97074 Würzburg — 2FZK Karlsruhe, Gemeinschaftslabor für Nanoanalytik, D-76021 Karlsruhe
Heterointerfaces between different organic molecules are an issue of great technologic relevance. However, structurally well-defined ultrathin interfaces which are suited for the investigation with surface sensitive techniques are difficult to prepare. In order to exploit its potential as a model system in this respect we have investigated hetero-layers consisting of tin-phthalocyanine (SnPc) and perylene-tetracarboxylic acid dianhydride (PTCDA) deposited on clean Ag(111) surfaces with photoelectron spectroscopy (XPS and UPS), x-ray absorption and low energy electron diffraction (LEED). The spectroscopic signatures of the two compounds can be distinguished unambiguously in the core and valence spectra. For ultra-thin SnPc layers deposited on a single layer of PTCDA on Ag(111) structural information can be derived from angle resolved XPS and NEXAFS. The data indicates that a closed monomolecular layer of flat lying SnPc is established. This is corroborated by the UPS spectra which show a characteristic splitting of the SnPc HOMO signal due to dimer formation only for SnPc coverages beyond one layer. Moreover, LEED was applied in order to investigate the lateral ordering.