Dresden 2014 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 3: Symposium SKM Dissertation-Prize 2014

BP 3.1: Hauptvortrag

Montag, 31. März 2014, 11:00–11:25, CHE 89

Interplay of ordering behavior and optical properties in organic semiconductor blends — •Katharina Broch — Universität Tübingen, Institut für Angewandte Physik, Auf der Morgenstelle 10, 72076 Tübingen, Germany

Binary mixtures of organic semiconductors (OSCs) have recently become an important field of research due to their potential applications in opto-electronic devices. In these systems, the mixing (intermixing vs. phase separation) and ordering behavior is crucial, since it affects the optical and electronic properties. Investigating binary mixtures of the three prototypical OSCs pentacene (PEN), perfluoropentacene (PFP) and diindenoperlyene (DIP) in all possible combinations, allows to study systematically the influence of the competing effects of favorable intermolecular interactions and steric incompatibility on film structure and optical properties. The focus of the talk will be on the optical spectra determined post-growth, for which the impact of intermolecular interactions, including charge transfer [1], and of differences in mixing and ordering behavior on the spectral shape and peak positions will be discussed [2]. In particular, for PEN:DIP an anisotropic ordering behavior, comparable to that observed in some liquid crystals, is found, which is fundamentally new for OSCs [3] and which opens possibilites for a targeted tuning of intermolecular interactions in blends. [1] K. Broch et al., Phys. Rev. B, 83 (2011), [2] K. Broch et al., J. Phys. Chem. C, 117 (2013), [3] A. Aufderheide et al., Phys. Rev. Lett., 109 (2012).