Regensburg 2013 – scientific programme

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DS: Fachverband Dünne Schichten

DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells

DS 32.14: Poster

Thursday, March 14, 2013, 17:00–20:00, Poster B2

The influence of molecular tilt angle on the absorption spectra of pentacene:perfluoropentacene blends — •Katharina Broch, Christoph Bürker, Johannes Dieterle, Alexander Gerlach, and Frank Schreiber — Universität Tübingen, Institut für Angewandte Physik, Auf der Morgenstelle 10, 72076 Tübingen

The understanding of the optical properties of organic semiconductor blends is not only crucial for the optimization of opto-electronic devices but also of relevance for fundamental research, since it sheds light on intermolecular interactions within the films. The absorption spectra of mixed systems can be influenced by different effects, such as charge-transfer interactions within a donor-acceptor system [1,2] or structural disorder [3,4]. Using spectroscopic ellipsometry and near-edge X-ray absorption fine structure spectroscopy (NEXAFS) we investigate equimolar mixtures of perfluoropentacene (PFP) and pentacene (PEN) grown at diverse substrate temperatures. Depending on the preparation conditions, the absorption spectra exhibit significant differences. By determining the molecular tilt angles from the NEXAFS-data and by comparing our results with the structural order and the morphology [5], we discuss the effects of film structure and molecular orientation on the optical properties. [1] F. Anger et al., J.Chem.Phys., 136, 054701 (2011); [2] K. Broch et al., Phys.Rev.B., 83, 245307 (2011); [3] A. Aufderheide et al., Phys.Rev.Lett, 109, 156102 (2012); [4] K. Broch et al., in preparation; [5] A. Hinderhofer et al., J.Chem.Phys., 134, 104702 (2011); [6] A. Hinderhofer and F. Schreiber, Chem.Phys.Chem., 13, 628 (2012)