Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory

O 36.12: Poster

Dienstag, 1. April 2014, 18:30–22:00, P1

Adsorption of HTMGT on Au(111): Influence of Surface Roughness — •Jan Pischel¹, Anna Lebkücher², Hans-Jörg Himmel², and Annemarie Pucci¹ — ¹Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, D-69120 Heidelberg — ²Institut für anorganische Chemie, Im Neuenheimer Feld 270, D-69120 Heidelberg

Hexakis(tetramethylguanidinyl)triphenylene (HTMGT) is a guani-dinyl-functionalized aromatic compound (GFA) recently synthesized in the group of H.-J. Himmel in Heidelberg. GFAs are strong electron donors and can be linked to semiconducting polymers under formation of coordinative bonds mediated, e. g., by copper and iodine [1]. Furthermore, due to appropriate HOMO and LUMO levels (calculation), HTMGT is an interesting material for application in active layers of organic field effect transistors.

We show here an infrared (IR) reflection absorption spectroscopic investigation of its adsorption on the Au(111) surface and focus especially on the influence of surface roughness. Roughness in the sub-monolayer region is introduced in a well-defined manner by evaporation of gold onto the pristine Au(111) surface cooled to 40K. The different regimes of substrate roughness are determined by using carbon mon-oxide as a probe for IR spectroscopy.

[1] H.-J. Himmel, Z. Anorg. Allg. Chem., 639:1940–1952, 2013.