Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 12: Morphology Prediction at Interfaces
O 12.2: Talk
Monday, March 7, 2016, 15:15–15:30, S051
Structural properties of picene-perfluoropentacene and picene-pentacene blends: Superlattice formation versus limited intermixing — J. Dieterle1, K. Broch1,2, A. Hinderhofer1, H. Frank1, J. Novák3, •A. Gerlach1, T. Breuer4, R. Banerjee1, G. Witte4, and F. Schreiber1 — 1Institut für Angewandte Physik, Universität Tübingen, Germany — 2Cavendish Laboratory, University of Cambridge, UK — 3Central European Institute of Technology, Masaryk University, Czech Republic — 4Fachbereich Physik, Philipps-Universität Marburg, Germany
The structure and morphology of mixed thin films of picene (C22H14, PIC) and perfluoropentacene (C22F14, PFP) as well as mixed thin films of PIC and pentacene (C22H14, PEN) grown by simultaneous coevaporation is investigated using X-ray diffraction, atomic force microscopy, and near-edge X-ray absorption spectroscopy. For both systems we find mixing on the molecular level and the formation of mixed structures. However, due to the strongly different interactions in both mixtures the ordering is fundamentally different [1].
The results are discussed in the context of other organic semiconductor binary mixtures [2] showing that besides chemical composition and steric compatibility the intramolecular arrangement of the atoms important for intermolecular interactions significantly influences the structure formation in organic semiconductor blends.
J. Dieterle et al., J. Phys. Chem. C 119 (2015) 23211.
C. Lorch et al., Appl. Phys. Lett. 107 (2015) 201903.