Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 65: Poster: Molecular Nanostructures on Surfaces

O 65.2: Poster

Wednesday, March 20, 2024, 18:00–20:00, Poster C

Step reconstruction from metal-molecule interaction — •Julie Teerink, Aleš Cahlík, Danyang Liu, Carolina A. Marques, and Fabian D. Natterer — Department of Physics, University of Zurich, Winterthurerstrasse 190, CH-8057, Switzerland

The model system for metal-molecule interaction PTCDA/Ag(111) shows diverse structural phases and strong charge-transfer. Co-adsorption of PTCDA and Ag-adatoms leads to substantial mass transfer and restructuring of the substrate surface. The PTCDA molecules embed themselves into Ag step edges, which strongly curve and form isolated Ag step-spirals or Ag islands, depending on the presence of substrate screw dislocations. These islands and step-spirals show 2D and 1D quantum confinement of the Ag surface state. To investigate the relationship between molecule length and step curvature, we co-deposit Ag-adatoms with NTCDA, a molecule with the same oxygen-carbon bonds as PTCDA but with a smaller carbon backbone.

Keywords: PTCDA; metal-molecule interaction; co-adsorption; organic semiconductor