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Light-trapping structures for planar solar cells inspired by transformation optics

Dhawan, Prerak 1; Gaudig, Maria; Sprafke, Alexander; Wehrspohn, Ralf B.; Rockstuhl, Carsten 1,2
1 Institut für Theoretische Festkörperphysik (TFP), Karlsruher Institut für Technologie (KIT)
2 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)


Optimal light absorption is decisive in obtaining high-efficiency solar cells. An established, if not to say the established, approach is to texture the interface of the light-absorbing layer with a suitable microstructure. However, structuring the light-absorbing layer is detrimental concerning its electrical properties due to an increased surface recombination rate (owing to enlarged surface area and surface defects) caused by the direct patterning process itself. This effect lowers the efficiency of the final solar cells. To circumvent this drawback, this work theoretically explores a transformation optics (TrO) inspired approach to map the nanopatterned texture onto a planar equivalent. This offers a pattern with the same optical functionality but with much improved electrical properties. Schwarz-Christoffel mappings are used for ensuring conformality of the maps. It leads to planar, inhomogeneous, dielectric-only materials for the light trapping structure to be placed on top of the planar light-absorbing layer. Such a design strategy paves a way towards a novel approach for implementing light-trapping structures into planar solar cells.

Verlagsausgabe §
DOI: 10.5445/IR/1000134587
DOI: 10.1364/OE.426712
Zitationen: 7
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Institut für Theoretische Festkörperphysik (TFP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 06.2021
Sprache Englisch
Identifikator ISSN: 1094-4087
KITopen-ID: 1000134587
HGF-Programm 43.32.02 (POF IV, LK 01) Designed Optical Materials
Erschienen in Optics express
Verlag Optica Publishing Group (OSA)
Band 29
Heft 13
Seiten 19903-19919
Vorab online veröffentlicht am 10.06.2021
Nachgewiesen in Scopus
Web of Science
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