Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

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

O 54.7: Talk

Wednesday, March 14, 2018, 12:15–12:30, MA 004

Porphyrins on Titania — •Thilo Glatzel¹, Res Jöhr², Antoine Hinaut¹, Silvio Decurtins³, Shi-Xia Liu³, Tobias Meier¹, Rémy Pawlak¹, and Ernst Meyer¹ — ¹University of Basel, Department of Physics, 4056 Basel, Switzerland — ²Lehrstuhl für Angewandte Physik, Ludwig-Maximilians-Universität, 80799 Munich, Germany — ³University of Bern, Department of Chemistry, 3012 Bern, Switzerland

Titania surfaces sensitized with metallo-porphyrins are of increasing interest for photocatalysis or photovoltaics. In these applications, the dye absorbs light and injects the exited electron into the conduction band of the titania. The binding configuration is thereby of great importance for the electron transfer process. To simultaneously investigate the binding configuration and its influence on the charge transfer process, nc-AFM and in particular KPFM are the methods of choice. We studied the adsorption configurations of single Cu-TCPP molecules, a sensitizer commonly used for photocatalysis, on anatase and rutile TiO2(110). Bimodal nc-AFM at room temperature and under UHV was applied to obtain high resolution on the molecules as well as on the substrate. KPFM was used to investigate the electronic properties of the adsorbed Cu-TCPP. The experimental data reveals that the Cu-TCPP molecules align themselves with respect to the substrate structure resulting in two main orientations. In both cases the KPFM showed a lowered LCPD on the sensitizer, indicating that adsorption is accompanied by charge transfer from the sensitizer to the substrate.