Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 48: Organic semiconductors II (joint session HL/CPP)

HL 48.5: Talk

Wednesday, March 18, 2020, 16:45–17:00, POT 112

Light-assisted charge propagation in organic semiconductor networks on hexagonal boron nitride — Matkovic Aleksandar¹, Genser Jakob¹, •Kratzer Markus¹, Lüftner Daniel², Chen Zhongrui³, Siri Olivier³, Puschnig Peter², Becker Conrad³, and Teichert Christian¹ — ¹Institute of Physics Montanuniversität Leoben Franz Josef Strasse 18, Leoben 8700, Austria — ²Institute of Physics Karl-Franzens-Universität Graz NAWI Graz Universitätsplatz 5, Graz 8010, Austria — ³Aix 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.