Dresden 2020 – scientific programme

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DS: Fachverband Dünne Schichten

DS 13: Layer Deposition II: Deposition Methods

DS 13.2: Talk

Monday, March 16, 2020, 17:00–17:15, CHE 89

Real time video analysis of droplets in spray pyrolysis deposition process — •Jonas Köhling and Veit Wagner — Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany

Spray pyrolysis is a cost-effective and scalable process used for deposition of thin functional films in areas of electronic, optics or even medicine. The properties of the thin films are influenced by the behavior of droplets with respect to the surface temperature of the substrate used for the deposition. Usually, smoother films were observed for temperatures higher than Leidenfrost temperature [1], which depends mainly on the solvent and the substrate.

In this work, we have developed a system to monitor the interaction of droplets smaller than 80 µm on a hot surface for a timescale below 1 ms. Such small droplets are produced by an ultrasonic atomizer and sprayed onto the substrate with controlled temperature. A high-speed camera with up to 10.000 frames per second is used to monitor the behavior of the droplets. Using a computer algorithm, the droplets are analyzed automatically and properties such as droplet size distribution and their lifetime have been determined. Analysis of the droplet lifetime allows for the systematic determination of Leidenfrost temperature and optimization of spray pyrolysis process for the thin film deposition.

[1] M. Ortel and V. Wagner, J. Cryst. Growth, 2013, 363, 185-189