Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 69: Plasmonics and Nanooptics VI: Light-Matter Interactions and Characterisation
O 69.4: Talk
Wednesday, March 22, 2017, 11:15–11:30, TRE Ma
Colloid-defined Scattering Interfaces with Tailored Disorder for PV Applications — Peter Michael Piechulla1, •Lutz Mühlenbein1, Alexander Sprafke1, Ralf B. Wehrspohn1, Stefan Nanz2, Aimi Abass2, and Carsten Rockstuhl2 — 1FG Mikrostrukturbasiertes Materialdesign, MLU Halle-Wittenberg — 2Institut für Theoretische Festkörperphysik, KIT, Karlruhe
Optical interfaces with tailored scattering properties are of interest for numerous applications, such as light management in photonic devices. In particular, thin film solar cell absorber materials exhibit long absorption lengths in the long wavelength range compared to the absorber thickness, which makes effective light trapping structures indispensable. Numerical studies reveal that interfaces with a certain degree of disorder outperform strictly periodic structures due to their improved broadband response. However, the proposed design in these studies are mostly either hypothetical in nature or rely on expensive top down fabrication methods. In our approach, we deposite a monolayer of colloidal particles onto a substrate using self-organization effects. Colloidal size distribution and manipulation of interaction potentials between particles and substrate provide effective levers to obtain desired surface profiles. The structure is then stabilized by conformal coating using atomic layer deposition and can be used as back side structure for solar cells. In this contribution, we will identify relevant fabrication parameters of these structures and present experimental data for their scattering properties. The presented experimental work is motivated by optical simulations that are specific to colloidal structures.