Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster 1
CPP 12.75: Poster
Montag, 5. September 2022, 18:00–20:00, P1
Ground-state charge transfer and influence on charge carrier transport in organic donor-acceptor mixtures — •Hongwon Kim1, Florian Fenzel1, Domenik Vögel1, Andreas Opitz2, and Wolfgang Brütting1 — 1Experimental Physics IV, Institute of Physics, University of Augsburg, 86135 Augsburg — 2Supramolekulare Systeme, Institut für Physik, Humboldt-Universität zu Berlin, 12489 Berlin
In organic semiconductors, charge transfer (CT) states form at interfaces or in mixtures of electron accepting and donating molecules. Their mutual electronic interaction is accompanied by a partial or full transfer of electric charges. This charge transfer is crucial to generate excess charges in (opto-)electronic devices, i.e. to facilitate electrical doping.
We have investigated donor-acceptor thin films consisting of electron donating molecules (DIP, 6T, DBTTF, and DBP) mixed with strong acceptors (F6TCNNQ and HATCN). It is investigated that the thermal activation energy (Ea) decreases and the electrical conductivity (σ) increases through doping by strong acceptors. Furthermore, the formation of CT states accelerates this doping effect and a highly improved conductivity can be obtained on DBTTF/F6TCNNQ as well as DIP/F6TCNNQ mixed thin films. This high conductivity is a result of increased concentration of charge carriers by doping effect as well as its improved mobility by CT states formation. However, the formation of CT states also has characteristic spectroscopic signatures and affects the growth behavior of molecular donor-acceptor blends.