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Proceedings Paper

Inverted-opal photonic crystals for ultra light-trapping in solar cells
Author(s): J. Üpping; C. Ulbrich; C.. Helgert; M. Peters; L. Steidl; R. Zentel; T. Pertsch; U. Rau; R. B. Wehrspohn
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Paper Abstract

We investigated a three dimensional inverted opal having the potential to notably increase light-trapping in solar cells. The 3D photonic crystal top layer is an angle- and direction-selective filter, which decreases the acceptance cone of the solar cell. Numerical optimisation methods are used to verify the optical and electrical properties for a large angluar and energy spectrum for a system consisting of an inverted opal on top of a thin crystalline silicon solar cell. It is numerically shown that an inverted opal grown in the Τ - Xdirection might fulfill the requirement for such a filter. An estimate for the theoretically achievable efficiency for nonconcentrated light is presented that do show an enchanced efficiency near the electronic band edge of the absorber. The fabrication of first opals grown in Τ - Xdirection is presented and discussed with respect to the quality and large scale fabrication.

Paper Details

Date Published: 18 May 2010
PDF: 7 pages
Proc. SPIE 7725, Photonics for Solar Energy Systems III, 772519 (18 May 2010); doi: 10.1117/12.854573
Show Author Affiliations
J. Üpping, Martin-Luther-Univ. Halle-Wittenberg (Germany)
C. Ulbrich, Forschungszentrum Jülich GmbH (Germany)
C.. Helgert, Friedrich-Schiller-Univ. Jena (Germany)
M. Peters, Fraunhofer Institute for Solar Energy Systems (Germany)
L. Steidl, Johannes Gutenberg Univ. Mainz (Germany)
R. Zentel, Johannes Gutenberg Univ. Mainz (Germany)
T. Pertsch, Friedrich-Schiller-Univ. Jena (Germany)
U. Rau, Forschungszentrum Jülich GmbH (Germany)
R. B. Wehrspohn, Martin-Luther-Univ. Halle-Wittenberg (Germany)
Fraunhofer Institute for Mechanics of Materials (Germany)

Published in SPIE Proceedings Vol. 7725:
Photonics for Solar Energy Systems III
Ralf B. Wehrspohn; Andreas Gombert, Editor(s)

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