Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session III
CPP 37.18: Poster
Mittwoch, 3. April 2019, 11:00–13:00, Poster B1
p-type doping of organic semiconductors with polycyclic acceptors — •Adriana Röttger1, Berthold Wegner1, Andreas Opitz1, and Norbert Koch1,2 — 1Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin — 2Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
Predictions about ion pair formation (IPA) of organic donor/acceptor blends can be made based on redox-potentials measured by cyclic voltammetry in solution or based on ionisation energies (IE) / electron affinities (EA) measured on thin films by direct / inverse photoelectron spectroscopy. Here, we investigate the accuracy of these predictions for two different organic semiconductor systems in solutions and thin films. At first optical absorption spectroscopy is employed to determine IPA yield in mixtures of two pyrene derivatives as donors and three polycyclic acceptors, which exhibit similar chemical structures. Since the predictions from redox potential and IE/EA do not differ significantly, both prove accurate. The second system consists of the polymer P3HT doped with the same set of acceptors. Again, optical absorption spectroscopy was used to determine the presence of ionic molecular species as well as formed polarons in P3HT. These predictions also prove accurate. In addition, scanning force microscopy and current-voltage measurements were performed to examine the impact of doping on surface morphology and electrical conductivity of P3HT films, respectively.