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O: Fachverband Oberflächenphysik

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

O 37.107: Poster

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

Processing and characterization of photonic crystals on flexible substrates for light absorption enhancement in solar cells — •Frederik Bub¹, Daniela Schneevoigt¹, Alexander Sprafke¹, and Ralf Wehrspohn^1,2 — ¹Martin-Luther-Universität, Halle-Wittenberg, Germany — ²Fraunhofer IWM, Halle, Germany

The success of the photovoltaic technology depends highly on two opposing improvements: saving material and therefore costs and increasing efficiency. One easy and cheap way to solve this conflict of interests is an advanced light management with photonic crystals to increase the light path in the absorber material.

Thus, we developed a production method for photonic crystals on flexible substrates based on a spray coating technique. The main advantage of this procedure is the fast assembly of photonic crystals consisting of polymeric colloids and the creation of a light management device separated from the solar-cell production line which allows easy integration into existing cell concepts. [1]

We produced photonic crystals respectively artificial opals on flexible substrates such as aluminum foil. The quality of the crystals was characterized optically, spectroscopically and mechanically. In detail we investigated the crystallization behavior of the artificial opals on flexible substrates by electron microscopy and analyzed the optical reflection. The stability and adhesion of the opaline films were qualified by applying mechanical stress to the flexible substrate.

[1] Sprafke, A, Schneevoigt, D, Seidel, S., Schweizer, S., Wehrspohn, R; Opt. Expr., 21(26): 528, (2013)