Dresden 2017 – scientific programme
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DS: Fachverband Dünne Schichten
DS 42: Metallic Nanowires on Semiconductor Surfaces (jointly with O)
DS 42.11: Talk
Thursday, March 23, 2017, 17:30–17:45, WIL C107
Functionalization of Si(553)-Au surface with hydrogen and small organic molecules — •Julian Plaickner1, Sandhya Chandola1, Eugen Speiser1, Svetlana Suchkova1, Norbert Esser1, and Simone Sanna2 — 1Schwarzschildstrasse 8, 12489 Berlin — 2Warburger Str. 100, 33098 Paderborn
Atomic metallic chains deposited on vicinal Si substrates form templates for the growth of hybrid molecule-solid nanostructures. The advantage of these structures is the possibility to vary the substrate geometry and the metallic element. We investigate the adsorption of toluene-3,4-dithiol molecules on hydrogen-passivated Si(553)-Au surfaces as model system/process. Hydrogen is able to drive a reversible metal-insulator transition on the Si(553)-Au surface and is also changing the adsorption geometry of organic molecules, extending the functionalization possibilities of the surface in organic electronics and biosensing.
We are using a set of polarization-sensitive optical techniques, such as Raman Spectroscopy (RS), Reflection Anisotropy Spectroscopy (RAS) and Infrared Spectroscopic Ellipsometry (IRSE). Our approach consists in establishing a direct connection between optical spectra and surface structure via ab-initio calculations. Optical fingerprints allow us to gain information on structural and electronic properties of the system.
The plan for the future is the realization of highly ordered molecular array geometries and the understanding of charge transfer between molecules and atomic wires. This will open possibilities for further functionalization through modification of terminal groups of molecules.