Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 23: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures II

O 23.1: Invited Talk

Tuesday, March 13, 2018, 10:30–11:00, MA 004

Electronic properties of functional organic compounds at surfaces: From zero- to two-dimensional — •Petra Tegeder — Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut

For improvement and optimization of the performance of organic molecule-based devices, comprehensive insight into the physical and chemical properties of the organic material at surfaces is necessary. I will present two case studies in which we investigated the electronic properties of organic/inorganic hybrid systems, namely graphene nanoribbons (GNRs) on gold surfaces and photochromic molecular switches on silicon. The GNRs are generated using a bottom-up approach based on a thermally activated and surface-assisted reaction of suitable precursor molecules. We studied the effect of N-doping on the energy level alignment. Additionally, we identified excitonic states in GNRs on gold surfaces. Incorporating photochromic molecules into organic/inorganic hybrid materials can lead to photoresponsive systems. In such systems, the second-order nonlinear optical properties can be controlled via external stimulation with light at an appropriate wavelength, which we could demonstrate.