Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 61: Posters III (Organic-inorganic perovskite semiconductors; Organic photovoltaics and electronics; Photovoltaics; Energy science; New materials and concepts)

HL 61.27: Poster

Wednesday, March 18, 2015, 15:00–20:00, Poster F

Comparison of the polarization-resolved linear absorption and time-resolved photoluminescence properties of crystalline perfluoropentacene on various substrates — •David Leimbach, Robin Döring, Tobias Breuer, Gregor Witte, and Sangam Chatterjee — Faculty of Physics and Materials Science Center, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany

Perfluoropentacene (PFP) is the perfluorinated counterpart and hence n-type organic semiconductor to the prototypical p-type pentacene. It can be grown as highly crystalline thin films on various optically transparent substrates such as NaF, KCl, and graphene. While PFP forms in the typical herringbone motif on both NaF and KCl, it shows a *Brickwall*-like polymorphism on graphene. Structural analyses show a π-stacking distance of only 3.07 Å [1], promising far higher values for electron and hole mobility and therefore greatly improved vertical transport, a desirable feature in potential organic electronic applications. Here, we investigate the influence of the packing motif and hence of the intermolecular coupling on the optoelectronic properties. Making use of polarization-resolved linear-absorption spectroscopy with sub-*m spatial resolution we identify the corresponding exciton transition energies and correlate them with the orientation of crystalline domains and the substrate. Furthermore, we find altered carrier recombination dynamics using time-resolved micro-photoluminescence spectroscopy.