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 59.10: Poster

Mittwoch, 24. März 2010, 17:45–20:30, Poster B1

Exploring the CoPc@HOPG interface: STM and STS study — •Lars Smykalla, Marius Toader, Pavel Shukrynau, and Michael Hietschold — Chemnitz University of Technology, Institute of Physics, Solid Surfaces Analysis Group, D-09107 Chemnitz, Germany

Using an UHV VT-STM, we report results obtained on a submonolayer of cobalt(II)-phthalocyanine (CoPc) grown on Highly Oriented Pyrolytic Graphite (HOPG) by OMBD. The very low deposition rate has allowed the formation of large defect-free self-assembled organic domains, mainly governed by the molecule-molecule interaction, where sometimes different orientation of the molecules with respect to each other leads to the development of relatively new type of structure. Nevertheless, the reported coexistence of molecular multi-phases has to be discussed in terms of the epitaxial relation between the organic adlayer structure and substrate surface orientation. Tip-sample distance-dependent scanning tunneling spectroscopy studies have been addressed in order to understand the electronic properties at the organic-inorganic interface. The observed shift in the molecular levels induced by the current set point variation is discussed and compared with the energy level diagram obtained by single molecule DFT calculations.