Dresden 2017 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Poster: Surfaces, Interfaces, Thin Films, Nanostructures
CPP 49.9: Poster
Mittwoch, 22. März 2017, 18:30–21:00, P2-OG1
Direct photo alignment of tetracene via light-directed molecular self-assembly (LDSA) — •Linus Pithan1,3, Paul Beyer1, Laura Bogula1, Anton Zykov1, Peter Schäfer1, Jonathan Rawle2, Chris Nicklin2, Andreas Opitz1, and Stefan Kowarik1 — 1Humboldt-Universität zu Berlin, Institut für Physik — 2Diamond Light Source, Didcot, UK — 3ESRF, Grenoble, France
There is an ongoing quest to tailor molecular thin film growth and thereby enhance the functionality of organic thin film structures. Here, we introduce light-directed molecular self-assembly (LDSA) to align and pattern molecular crystallites on amorphous, isotropic substrate.[1] We grow tetracene (C18H12) thin films on amorphous SiOx surfaces via organic molecular beam deposition (OMBD) and study the direct-photo-alignment of molecular crystallites through 532 nm laser illumination, which matches the absorption band of the lower Davydov component of tetracene.
Based on LDSA we produce thin films that feature patterned, polarised optical emission due to the inherent anisotropic optical properties of aligned polycrystalline tetracene structures. We use grazing incidence X-ray diffraction (GIXD) as well as polarisation sensitive optical spectroscopy to analyse the degree of azimuthal alignment in the film and its dependency on the laser light intensity during growth.
[1] L. Pithan et. al. Adv. Mater. 2016 doi:10.1002/adma.201604382