Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: Poster: Organic Electronics and Photovoltaics
CPP 30.16: Poster
Dienstag, 8. März 2016, 18:15–21:00, Poster B2
Influence of crosslinking on charge carrier mobility in PF2/6-derivatives — •Frank-Julian Kahle1, Irene Bauer2, Anna Köhler1, and Peter Strohriegl2 — 1Department of Physics, University of Bayreuth, Germany — 2Department of Chemistry, University of Bayreuth, Germany
Cross-linking provides a good means to fabricate optoelectronic devices with multiple layers via solution processing. In the current work, a series of especially synthesized PF2/6 derivatives with different fractions of cross-linkable acrylate groups is investigated. Spectroscopic characterization and mobility measurements are carried out to assess the influence of introducing acrylate groups and crosslinking on material performance. For the regime of low to medium charge carrier density, relevant for OLEDs and OPVs, we used a novel technique based on the injection of charge carriers from the electrodes of an optoelectronic device: MIS-CELIV. This technique allows for the selective measurement of electron or hole mobility. By comparing crosslinked samples with pure PF2/6 as reference, we could show that the crosslinking process itself does not significantly influence hole mobility in the investigated system. An observed reduction of about one order of magnitude is attributed to structural differences caused by the introduction of acrylate groups. Furthermore, it turned out that the crosslinking process may be solely triggered by thermal activation and UV-illumination without the need of any photoinitiator, still achieving a densely linked network. This is of special interest as we have seen that a larger amount of photoinitiator may introduce traps for charge carrier transport.