Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 58: Organic molecules on inorganic substrates: Adsorption and growth III

O 58.2: Vortrag

Mittwoch, 11. März 2026, 10:45–11:00, TRE/PHYS

Rare earth modified silicon surfaces: A promising template for ordered organic growth — •Milan Kubicki, Philipp Gruber, Marie-Louise Fraser, Mario Dähne, and Martin Franz — Technische Universität Berlin, Institut für Physik und Astronomie, Berlin, Germany

The formation of self-assembled layers of organic molecules on solid surfaces is an important research field because of their possible application in advanced (opto)electronic devices. While the formation of self-assembled layers is well established on metal surfaces, the growth on silicon surfaces, which are still the material of choice in present semiconductor technology, is much less studied. On pure silicon, however, the formation of ordered organic films is usually hindered by its high dangling bond density, so that an appropriate surface modification is required.

Here we demonstrate the high potential of a rare-earth modification of the Si(111) surface for promoting ordered growth. Using scanning tunneling microscopy, the adsorption of different organic molecules on rare-earth modified silicon surfaces was examined, exemplarily for highly reactive N-heterocyclic carbenes and less reactive transition metal phthalocyanines. Our data demonstrate that single molecules remain mobile on the surface at room temperature. At a coverage of one full monolayer highly ordered films can be formed, demonstrating the great potential of rare-earth modified silicon surfaces as template for organic film growth.

[1] M. Kubicki et al., J. Phys. Chem. C 128, 13347 (2024).

Keywords: rare-earth; silicon; organic molecules; self-assembly; surface modification