Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Inorganic/Organic Interfaces
O 41.49: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster B
Hierarchical and charge transfer effects in a bimolecular network of structurally related scaffolds — •Christian Steiner1, Maximilian Ammon1, Bettina Gliemann2, Ute Meinhardt2, Martin Gurrath3, Bernd Meyer3, Milan Kivala2, and Sabine Maier1 — 1Department of Physics, Universität Erlangen-Nürnberg, Germany — 2Department of Chemistry and Pharmacy, Universität Erlangen-Nürnberg, Germany — 3Interdisciplinary Center for Molecular Materials and Computer-Chemistry-Center, Universität Erlangen-Nürnberg, Germany
Functional electron donor-acceptor networks on metal surfaces are integral parts of organic optoelectronic devices such as solar-cells. Understanding and controlling the formation of multi-component molecular self-assemblies is important for the design of efficient donor-acceptor networks. Here, we present a scanning tunneling microscopy and spectroscopy study of a bimolecular network assembled from triarylamines with carboxylic and diaminotriazine functional groups on Au(111). The molecules form a perfectly intermixed honeycomb network via N···H-O hydrogen bonds. Density functional theory (DFT) calculations reveal that mainly geometrical aspects lead to the intermixing as opposed of an increase in binding strength. The HOMO-LUMO gap in the mixed network is defined by the two types of molecules, typical for a charge donor-acceptor scheme. The charge transfer process in the intermixed network will be discussed based on DFT calculations.