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All-Angle Invisibility Cloaking of Contact Fingers on Solar Cells by Refractive Free-Form Surfaces [in press}

Schumann, Martin F.; Langenhorst, Malte; Smeets, Michael; Ding, Kaining; Paetzold, Ulrich W.; Wegener, Martin

Abstract (englisch):
This work demonstrates a performance improvement of state-of-the-art silicon solar cells by cloaking their metal contact fingers. The cloaking free-form surfaces are fabricated on silicon heterojunction solar cells using direct laser writing of polymers and subsequent soft imprinting. Cloaking performance is determined experimentally by measuring spatially resolved and angle-resolved current generation and the spectral response of the cell. The short-circuit current density of the cell increases by 7.3%; its power-conversion efficiency is enhanced by 9.3%. Overcompensation of the shadowing loss is found to be caused by improved light-gathering and light-trapping in the polymer layer. The experimental findings are in good agreement to ray-tracing simulations.

Zugehörige Institution(en) am KIT Institut für Angewandte Physik (APH)
Institut für Mikrostrukturtechnik (IMT)
Institut für Nanotechnologie (INT)
Lichttechnisches Institut (LTI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1002/adom.201700164
ISSN: 2195-1071
KITopen ID: 1000071762
HGF-Programm 43.23.04; LK 01
Erschienen in Advanced optical materials
Seiten 1700164
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