Dresden 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 76: Organic semiconductors II (joint session HL/CPP)
CPP 76.5: Vortrag
Mittwoch, 18. März 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.