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Proceedings Paper

Laser-based foil rear side metallization for crystalline silicon solar cells
Author(s): Jan Nekarda; Martin Graf; Andreas Rodofili; Andreas Wolf; Ralf Preu
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Paper Abstract

In this contribution we present different results of our investigations regarding the use of aluminum foil as rear side metallization for solar cells with dielectric passivation and laser fired contacts (LFC). We investigate the impact of different laser processes on the resistance of the contacts, the adhesion properties of the foil and the efficiency potential. By fabricating highly efficient, 20×20 mm2 sized solar cells with a conversion efficiency of 21.0 %, we demonstrate the high potential of this approach, which is equal to that of LFC-cells with common screen-printed or PVD metallization on the rear side. We investigated the optical properties of such metallized rear sides which benefit from an embedded air gap between foil and passivation layer. Finally, we present first solar cell results on industrially sized wafers (A=238 cm2) demonstrating again the equal efficiency potential compared to PVD metallization.

Paper Details

Date Published: 12 October 2012
PDF: 14 pages
Proc. SPIE 8473, Laser Material Processing for Solar Energy, 847307 (12 October 2012); doi: 10.1117/12.929639
Show Author Affiliations
Jan Nekarda, Fraunhofer-Institut für Solare Energiesysteme (Germany)
Martin Graf, Fraunhofer-Institut für Solare Energiesysteme (Germany)
Andreas Rodofili, Fraunhofer-Institut für Solare Energiesysteme (Germany)
Andreas Wolf, Fraunhofer-Institut für Solare Energiesysteme (Germany)
Ralf Preu, Fraunhofer-Institut für Solare Energiesysteme (Germany)

Published in SPIE Proceedings Vol. 8473:
Laser Material Processing for Solar Energy
Edward W. Reutzel, Editor(s)

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