Dresden 2020 – scientific programme
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DS: Fachverband Dünne Schichten
DS 28: Poster: Thin Film Properties: Structure, Morphology and Composition
DS 28.2: Poster
Wednesday, March 18, 2020, 15:00–18:00, P1A
Characterization of photochromic diarylethene films produced via spin-coating — •Viktor Udachin1, Sven Nagorny2, Sebastian Dahle1, Jörg Adams3, Andreas Schmidt2, and Wolfgang Maus-Friedrichs1 — 1TU Clausthal, Institut für Energieforschung und Physikalische Technologien, Deutschland — 2TU Clausthal, Institut für Organische Chemie — 3TU Clausthal, Institut für Physikalische Chemie
Thin photochromic films that can reversibly change physico-chemical properties under suitable electromagnetic radiation have received considerable attention. Such functional coatings are crucial in development of novel optical imaging and lithography applications using photochromism [1, 2]. A promising photochromic substance is 4,4''-(perfluorocyclopent-1-ene-1,2-diyl)bis(5,5'-dimethyl-2,2'-bithiophene) (BTE-1) due to its comparatively high thermal- and photo-stability [2]. However, specifications of a spin-coating procedure to obtain homogeneous BTE-1 films with different optical properties are not well defined. In this study, we investigated the behaviour of BTE-1 during spin-coating and determined a set of parameters for the production of defect-free BTE1/PMMA coatings with different thicknesses. The films were produced on quartz substrates by changing spin-coating conditions and properties of solutions. The optical parameters, morphology and thickness of the films as well as the structure of the dye were studied via spectroscopic and microscopic techniques. [1] Kowarsch R. et al. Optics express 26.5 (2018): 5327-5341. [2] Andrew T. L., Tsai H. Y., Menon R. Science 324.5929 (2009): 917-921.