Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.79: Poster

Tuesday, April 1, 2014, 18:30–22:00, P2

Imaging and controlling organic molecule adsorption on metal plated silicon surfaces: formation and structure of organic-silicide monolayers — •Pavel Shukrynau, Marius Toader, Lars Smykalla, and Michael Hietschold — 1 Institute of Physics Technische Universität Chemnitz, Reichenhainer Straße 70, D-09107 Chemnitz, Germany.

We have employed variable temperature scanning tunneling microscopy (STM) to follow the adsorption of fluorinated cobalt-phthalocyanine (F16CoPc) on Fe plated silicon 7*7 reconstructed surface. The coverage of F16CoPc varied from 0.05 up to 3 monolayers (ML). At coverage more than a monolayer the surface is completely covered with roundly shaped 3D clusters of typical size of ~1 nm. Each cluster has lobe-like pattern that may suggest that they consist of several perpendicular standing phthalocyanine molecules. Tunneling spectra taken over each individual lobe within a cluster reveal small energy gap, showing semiconductor-like behavior of constituent parts. The general structure of the surface, i.e., shape of the step edges, remains unchanged, however, the cluster coverage/cluster size is substrate dependent. The interplay between the electronic and structural properties of molecular layers and transition metal silicide is the key to tune the functionalities of hybrid organic-semiconductor interfaces.