Laser-based foil rear side metallization for crystalline silicon solar cells

Jan Nekarda; Martin Graf; Andreas Rodofili; Andreas Wolf; Ralf Preu

doi:10.1117/12.929639

12 October 2012 Laser-based foil rear side metallization for crystalline silicon solar cells

Jan Nekarda, Martin Graf, Andreas Rodofili, Andreas Wolf, Ralf Preu

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Proceedings Volume 8473, Laser Material Processing for Solar Energy; 847307 (2012) https://doi.org/10.1117/12.929639
Event: SPIE Solar Energy + Technology, 2012, San Diego, California, United States

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.

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Jan Nekarda, Martin Graf, Andreas Rodofili, Andreas Wolf, and Ralf Preu "Laser-based foil rear side metallization for crystalline silicon solar cells", Proc. SPIE 8473, Laser Material Processing for Solar Energy, 847307 (12 October 2012); https://doi.org/10.1117/12.929639

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KEYWORDS

Laser processing

Solar cells

Aluminum

Semiconducting wafers

Resistance

Printing

Silicon

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