Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )

O 36.64: Poster

Dienstag, 12. März 2013, 18:15–21:45, Poster B2

Automated spray coating process for the synthesis of extensive artificial opals — •Daniela Schneevoigt¹, Alexander Sprafke¹, and Ralf Wehrspohn^1,2 — ¹Martin-Luther-Universität, Halle-Wittenberg, Deutschland — ²Fraunhofer IWM, Halle, Deutschland

3D photonic crystals such as artificial opals are a promising material class for the use in advanced light management concepts for solar cells [1]. To be able to integrate such concepts within the photovoltaic industry a low-cost and large-scale technique to produce photonic crystals of high quality is needed.

Here, we report on the successful implementation of an automated process for a spray induced self-assembly of 3D artificial opals. In contrast to previous work, non-porous substrates, such as glass or Si wafers are used. To achieve artificial opals of high quality, process parameters such as the solid content of the dispersion, the substrate material and the dispersion agent have to be adjusted. Most important is the understanding of the drying process, which is strongly affected by the choice of the aforementioned parameters. Therefore an extensive investigation of the influence of these parameters on the spray coating process was carried out in order to achieve a more precise understanding of the crystallization mechanism and to gain a better control over the fabrication process of artificial opals by spray coating.

[1] Sprafke, A., Wehrspohn, R., Light trapping concepts for photon management in solar cells. Green, 2(4): 177-187, (2012).