Regensburg 2016 – scientific programme

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DS: Fachverband Dünne Schichten

DS 4: Organic Thin Films I

DS 4.1: Invited Talk

Monday, March 7, 2016, 09:30–10:00, H11

Controlling and tailoring molecular thin film growth — •Stefan Kowarik — Institut für Physik, Humboldt Universität Berlin, Newtonstr. 15, 12489 Berlin

Organic thin films are widely used in applications ranging from (opto-) electronic devices such as OLEDs to functional coatings e.g. in bio-sensors. Tailoring the thin film properties, such as molecular orientation, crystal structure and phase purity, surface roughness and grain size for a given application is therefore an important challenge. Here we demonstrate different strategies to tailor film growth and showcase important analytical tools to control film growth with in situ X-ray scattering and X-ray spectroscopy (XRR, GISAXS, NEXAFS) as well as UV-vis spectroscopy. We will discuss how micro-kinetic models of growth are starting to become available to predict the influence of the important parameters temperature and growth rate in determining (non-equilibrium) thin film structures. We will discuss how lattice matching with the substrate can be used to change the molecular orientation and how slight chemical modification of molecules can be used to alter the growth mode. Finally we will highlight novel ways to control molecular film growth e.g. by fast temperature cycles to separately control nucleation and coalescence in each monolayer or using laser light to increase phase purity in thin films.