SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

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

O 55.5: Talk

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

Growth of ordered two-dimensional cobalt phthalocyanine films on a one-dimensional substrate — •Milan Kubicki, Susi Lindner-Franz, Mario Dähne, and Martin Franz — Technische Universität Berlin, Institut für Festkörperphysik, Berlin, Germany

The formation of self-assembled layers of organic materials on solid surfaces is an important subject because of their possible application in advanced (opto-) electronic devices. While such a formation of self-assembled monolayers is well established on metal surfaces, the growth on silicon surfaces is much less studied.

Using scanning tunneling microscopy (STM) the molecular arrangement of cobalt phthalocyanine (CoPc) molecules on the In-Si(111)(4×1) surface is studied [1]. CoPc belongs to the transition metal phthalocyanines being a class of organic semiconductors, which has been already employed e.g. in organic light emitting diodes, in organic photovoltaic cells, and in organic field-effect transistors.

Our data demonstrate that for low CoPc coverages the molecules are highly mobile along the In-Si nanowires. By approaching the saturation coverage, the CoPc molecules stabilize each other by forming a highly ordered two-dimensional monolayer. Based on STM observations a structure model with a (4×4) periodicity could be developed, which precisely explains the experimental observations.

[1] M. Kubicki, S. Lindner-Franz, M. Dähne, and M. Franz, Appl. Phys. Lett. 119, 133105 (2021).