Dresden 2014 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.104: Poster

Dienstag, 1. April 2014, 18:30–22:00, P2

Automated spray coating process for the fabrication of large-area opaline structures on textured substrates — •Daniela Schneevoigt¹, Frederik Bub¹, Alexander Sprafke¹, and Ralf Wehrspohn^{1, 2} — ¹Martin-Luther-Universität, Halle-Wittenberg, Deutschland — ²Fraunhofer IWM, Halle, Deutschland

3D photonic crystals, such as opaline structures, have been shown to have a high potential to increase the efficiency of solar cells by enabling advanced light management concepts. Our automated process for the spray induced self-assembly of large-area artificial opals presents a low-cost technique, which complies with the demands of the photovoltaic industry for the integration of such structures [1]. The process is based on spraying a dispersion of monodisperse nanoscaled colloids onto a substrate and subsequent crystallization of a 3D photonic crystal.

Here, we report on the successful fabrication of artificial opaline structures, such as opals and inverted opals, via spray coating on textured substrates.

With the intention to integrate opaline structures as back reflectors in µc-Si thin film solar cells, the crystallization of extensive artificial opals on different µc-Si surface textures was analyzed. The inversion of the opals was achieved with a conformal deposition of Al:ZnO (by atomic layer deposition) and a subsequent wet-chemical removal of the colloids. The optical, structural and electrical characteristics of these opaline structures were examined.

[1] Sprafke, A., Schneevoigt, D., Seidel, S., Schweizer, S. L., Wehrspohn, R., Optics Express, 21(26): 528, (2013).