Berlin 2018 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 18: Optical Analysis of Thin Films (Reflection, Ellipsometry, Raman, IR-DUV Spectroscopy, ...): Session I
DS 18.11: Vortrag
Mittwoch, 14. März 2018, 12:45–13:00, H 0111
Investigating the exitonic interactions by polarization-resolved spectro-microscopy of a textured squaraine thin film — •Dominik Höweling1, Luca Beverina2, Christoph Lienau1, Martin Silies1, and Manuela Schiek1 — 1Institute of Physics, University of Oldenburg, Germany — 2University of Milano-Bicocca, Milano, Italy
Small conjugated molecules like squaraines are a promising alternative to semiconducting polymers in the field of organic photovoltaics. Understanding the exitonic interaction of these molecules enables us to tailor devices for specific applications. In this study we use a home-built linear polarization-resolved spectro-microscope to investigate the molecular packing of crystalline nHSQ nanostructures. A characteristic "double-hump" signature in the absorption spectrum of nHSQ has been ascribed to the excitation of an intermolecular charge transfer band [1]. Our optical measurements show the excitation of these peaks at different angles. When comparing these angles with the known out-of-plane crystallographic orientation [2] we can predict the in-plane orientation of the nHSQ molecules. [1] Zheng et al. Sol. Energy Mater Sol. Cells 157, 366 (2014) [2] Brück et al. PCCP 16, 1067 (2014)