SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 55: Organic Molecules on Inorganic Substrates IV: Adsorption and Growth II

O 55.4: Talk

Wednesday, March 29, 2023, 15:45–16:00, CHE 91

PTCDA mediated Ag(111) step reconstruction as precursor to pinwheel phase — •Danyang Liu¹, Aleš Cahlík¹, Carolina A. Marques¹, Jens Oppliger¹, Ruslan Temirov^2,3, and Fabian D. Natterer¹ — ¹Department of Physics, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland — ²Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany — ³University of Cologne, Faculty of Mathematics and Natural Sciences, Institute of Physics II, 50937 Cologne, Germany

PTCDA (3,4,9,10-Perylenetetracarboxylic dianhydride) forming herringbone islands on Ag(111) is the most striking phase and the prototypical metal-supported organic semiconductor. When we co-deposit PTCDA and Ag on Ag(111) at room temperature, we find that prior to their self-assembly into PTCDA herringbone islands, the molecules implant themselves into and reshape the Ag step edges. The PTCDA-decorated-Ag steps are curved and, depending on whether the Ag steps originate from screw dislocations or a terrace, cause steps reconstruction into multilayer high spirals or isolated Ag islands that both exhibit quantum confinement. At higher coverages, the PTCDA decorated steps may nucleate a distinct pinwheel phase that occasionally proceeds to form a metal-organic framework. Annealing to higher temperatures straightens the PTCDA/Ag steps and may grow more pinwheel phase PTCDA patches, showing yet another tuning knob for organometallic surface science.