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Proceedings Paper

Cloaking of contact fingers on solar cells and OLEDs using free-form surfaces designed by coordinate transformations (Conference Presentation)
Author(s): Martin F. Schumann; Malte Langenhorst; Michael Smeets; Kaining Ding; Ulrich W. Paetzold; Benjamin Fritz; Ralph Eckstein; Guillaume Gomard; Martin Wegener

Paper Abstract

In transformation optics, coordinate transformations are usually mapped onto equivalent (meta-)material parameter distributions. In 2015, we introduced an approach mapping coordinate transformations onto dielectric free-form surfaces. We presented model experiments on cloaking of reflective contact fingers on solar cells. We now report on the fabrication of masters by 3D laser lithography used for soft imprinting. For prototype silicon heterojunction solar cells investigated under 1-sun illumination, we demonstrate the predicted 9% relative efficiency increase. We additionally show that our approach is adaptable to Lambertian sources, thereby cloaking light-emitting diode contacts to achieve spatially homogeneous emission.

Paper Details

Date Published: 21 September 2017
Proc. SPIE 10343, Metamaterials, Metadevices, and Metasystems 2017, 1034314 (21 September 2017); doi: 10.1117/12.2272911
Show Author Affiliations
Martin F. Schumann, Karlsruher Institut für Technologie (Germany)
Malte Langenhorst, Karlsruher Institut für Technologie (Germany)
Michael Smeets, Forschungszentrum Jülich GmbH (Germany)
Kaining Ding, Forschungszentrum Jülich GmbH (Germany)
Ulrich W. Paetzold, Karlsruher Institut für Technologie (Germany)
Benjamin Fritz, Karlsruher Institut für Technologie (Germany)
Ralph Eckstein, Karlsruher Institut für Technologie (Germany)
InnovationLab GmbH (Germany)
Guillaume Gomard, Karlsruher Institut für Technologie (Germany)
Martin Wegener, Karlsruher Institut für Technologie (Germany)

Published in SPIE Proceedings Vol. 10343:
Metamaterials, Metadevices, and Metasystems 2017
Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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