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O: Fachverband Oberflächenphysik
O 4: Plasmonics and nanooptics: Fabrication and characterization
O 4.9: Vortrag
Montag, 12. März 2018, 12:30–12:45, MA 041
Characterization of 2D nearly-hyperuniform colloidal light management structures — •Lutz Mühlenbein1, Peter M. Piechulla1, Alexander Sprafke1, and Ralf B. Wehrspohn1,2 — 1FG Mikrostrukturbasiertes Materialdesign, MLU Halle-Wittenberg — 2Fraunhofer IMWS, Halle
Interfaces defined by the self-organization of colloidal particles to a monolayer on a substrate are promising candidates for cheap and effective light management structures. By controlling the colloidal size distribution and manipulating the interaction potentials between particles and substrate during the deposition process, we strive to produce structures with tailored light scattering properties to fit the specific requirements of a wide range of potential applications, such as thin-film solar cells and LEDs.
We present a method for fabricating large-area nearly-hyperuniform 2D colloidal structures by a self-stabilized immersion process. Furthermore, we develop a simulative description of the microscopic deposition process by a random sequential adsorption (RSA) model that allows for accurate prediction of structural characteristics of the fabricated samples. On the basis of the structure factor we are able to calculate the optical response by simple means and find good agreement with experimental measurements.