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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 49: Poster Session II

CPP 49.40: Poster

Dienstag, 17. März 2020, 14:00–16:00, P1A

Ground-state charge transfer and influence on charge carrier transport in organic donor-acceptor mixtures — Hongwon Kim, Marius Gebhardt, Domenik Vögel, and •Wolfgang Brütting — Experimental Physics IV, Institute of Physics, University of Augsburg, Augsburg Germany

In organic semiconductors, charge transfer states form at interfaces of electron accepting and donating molecules resulting in a partial or full transfer of electrical charges. This charge transfer doping is crucial to generate excess charges in (opto-)electronic devices. We have investigated charge transfer states and charge transport properties of organic semiconductor mixtures consisting of electron donating molecules, DIP, 6T, DBTTF, and DBP, doped by a strong acceptor, F6TCNNQ. Charge transfer effects are observed by optical absorption spectroscopy and electrical transport properties are characterized depending on field and temperature by current-voltage measurements and impedance spectroscopy. In this way, it is possible to distinguish between integer charge transfer states and charge transfer complex formation, and to explain high electrical conductivity at a certain doping concentration with morphology and derived design rules for efficient charge transfer.