SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 75: Poster Session VI: Organic molecules on inorganic substrates: electronic, optical and other properties II
O 75.8: Poster
Mittwoch, 3. März 2021, 13:30–15:30, P
Light-assisted charge propagation in organic semiconductor networks on hexagonal boron nitride — Aleksandar Matkovic1, Jakob Genser2, •Markus Kratzer1, Daniel Lüftner3, Zhongrui Chen4, Olivier Siri4, Peter Puschnig3, Conrad Becker4, and Christian Teichert1 — 1Institute of Physics Montanuniversität Leoben Franz Josef Strasse 18, Leoben 8700, Austria — 2Institute of Solid State Electronics, Technische Universität Wien, Gußhausstraße 25-25a, 1040 Vienna, Austria — 3Institute of Physics Karl-Franzens-Universität Graz NAWI Graz Universitätsplatz 5, Graz 8010, Austria — 4Aix Marseille University CNRS CINaM UMR 7325 Campus de Luminy 13288, Marseille cedex 09, France
Electrostatic force microscopy is utilized to track charge propagation in organic semiconductor nanoneedles. As model system, crystalline dihydrotetraazaheptacene needles epitaxially grown on ultrathin hexagonal boron nitride was investigated. Due to light exposure, the specific resistivity of the crystallites changed by two orders of magnitude. Exploiting the highly anisotropic optical properties of the organic nanoneedles, selective charge propagation along the crystallites was achieved by matching the incident light*s polarization direction with the direction of the molecular backbones in the crystals. Thus, it was possible to guide charge propagation along desired paths in self-assembled crystallite networks. This way, polarized light can be used as a "light gate" to control charge propagation.