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Proceedings Paper

Optimization of angularly selective photonic filters for concentrator photovoltaic
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Paper Abstract

To achieve higher efficiencies in solar cells one possibility is to integrate angular selective filters, with the aim of decreasing losses caused by radiative recombination. In fact, thermodynamically, angular selectivity is equivalent to concentration. In both cases the Shockley-Queisser-Limit of solar cells is overcome by manipulating the ratio of incoming and outgoing radiation represented by the angles of incidence and emission. In concentrating systems the angle of incidence is increased, whereas in systems with an angular confinement the angle of emission can be decreased. Another possibility to achieve highest efficiencies is to combine both, concentration and angular confinement. Starting with a given concentrating system, photonic angularly selective filters such as thin film stacks are investigated and optimized for the use in this system. We present results of wave optical simulations of these filters and show some of their characteristics. The goal of this study is, however, not only to optimize optical filters but also to consider the whole system. One approach is to use results from optical simulations as input values for detailed balance simulations of the solar cell. So, the main advantage is, that in fact not the optical characteristics are optimized separately, but rather the whole system is taken into account, which allows predictions of theoretical efficiency enhancement.

Paper Details

Date Published: 2 May 2012
PDF: 10 pages
Proc. SPIE 8438, Photonics for Solar Energy Systems IV, 84380A (2 May 2012); doi: 10.1117/12.921773
Show Author Affiliations
O. Höhn, Fraunhofer-Institut für Solare Energiesysteme (Germany)
M. Peters, Fraunhofer-Institut für Solare Energiesysteme (Germany)
C. Ulbrich, Forschungszentrum Jülich GmbH (Germany)
A. Hoffmann, Forschungszentrum Jülich GmbH (Germany)
U. T. Schwarz, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
B. Bläsi, Fraunhofer-Institut für Solare Energiesysteme (Germany)

Published in SPIE Proceedings Vol. 8438:
Photonics for Solar Energy Systems IV
Ralf Wehrspohn; Andreas Gombert, Editor(s)

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