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Proceedings Paper

Electric transport in 3D photonic crystal intermediate reflectors for micromorph thin-film tandem solar cells
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Paper Abstract

The progress of 3D photonic intermediate reflectors for micromorph silicon tandem cells towards a first prototype cell is presented. Intermediate reflectors enhance the absorption of spectrally-selected light in the top cell and decrease the current mismatch between both junctions. A numerical method to predict filter properties for optimal current matching is presented. Our device is an inverted opal structure made of ZnO and fabricated using self-organized nanoparticles and atomic layer deposition for conformal coating. In particular, the influence of ZnO-doping and replicated cracks during drying of the opal is discussed with respect to conductivity and optical properties. A first prototype is compared to a state-of-the-art reference cell.

Paper Details

Date Published: 20 August 2009
PDF: 8 pages
Proc. SPIE 7409, Thin Film Solar Technology, 74090J (20 August 2009); doi: 10.1117/12.824688
Show Author Affiliations
J. Üpping, Martin-Luther Univ. Halle-Wittenberg (Germany)
A. Bielawny, Martin-Luther Univ. Halle-Wittenberg (Germany)
S. Lee, Max Planck Institute for Microstructure Physics (Germany)
M. Knez, Max Planck Institute for Microstructure Physics (Germany)
R. Carius, Forschungszentrum Jülich GmbH (Germany)
R. B. Wehrspohn, Martin-Luther Univ. Halle-Wittenberg (Germany)

Published in SPIE Proceedings Vol. 7409:
Thin Film Solar Technology
Alan E. Delahoy; Louay A. Eldada, Editor(s)

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