Claudia López-Posadas (Johannes Kepler University Linz)
The structure and orientation of 5,14-dihydro-5,7,12,14-tetraazapentacene (DHTAP) layers deposited on Cu(110) was studied using reflectance difference spectroscopy (RDS), Scanning Tunneling Microscopy (STM) and Low Energy Electron Diffraction (LEED). The evolution of the RDS signal allows to identify the sequential formation of up to three monolayers as well as a phase transition upon completion of the first one. DHTAP molecules in the first monolayer are always lying flat with their long molecular axis aligned parallel to the [-110]-direction of the Cu(110) surface. However, for subsequent layers the orientation critically depends on the deposition temperature.
Claudia López-Posadas (Johannes Kepler University Linz) Michael Györök (Johannes Kepler University Linz) Antony Thomas (Aix-Marseille University) Thomas Leoni (Aix-Marseille University) Olivier Siri (Aix-Marseille University) Conrad Becker (Aix-Marseille University) Peter Zeppenfeld (Johannes Kepler University Linz)