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O: Fachverband Oberflächenphysik

O 54: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures III

O 54.8: Vortrag

Mittwoch, 14. März 2018, 12:30–12:45, MA 004

Anchoring of a dye precursor on NiO(001) studied by noncontact atomic force microscopy — •Sara Freund¹, Antoine Hinaut¹, Nathalie Marinakis², Edwin C. Constable², Ernst Meyer¹, Catherine Housecroft², and Thilo Glatzel¹ — ¹Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland — ²Department of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, 4058 Basel, Switzerland

The properties of metal oxides can be modified when functionalized with complex molecules. These kinds of organic/inorganic surfaces have become important for enabling technologies such as hybrid photovoltaic p-type dye sensitized solar cells. A key parameter for optimized interfaces is not only the choice of the functionalization compounds but also their adsorption geometry on the substrate. The latter requires fundamental studies of such surface-molecule interactions at the nanoscale.

In this contribution, we describe the use of non-contact atomic force microscopy at room temperature to investigate the adsorption of a common organic dye precursor molecule on a NiO(001) single crystal surface. Depending on the degree of surface coverage, single molecules, groups of adsorbates with random or recognizable shapes, or even islands and domains can be identified. The interfaces were imaged with sub-molecular resolution, revealing that the dye precursor lies flat on the surface in a trans-conformation. A charge transfer from NiO to the molecular layer was observed and quantified by Kelvin probe force microscopy, only in the areas, where the molecules are closed packed.