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LFC on screen printed aluminium rear side metallization

: Nekarda, J.; Stumpp, S.; Gautero, L.; Hörteis, M.; Grohe, A.; Biro, D.; Preu, R.

Volltext urn:nbn:de:0011-n-1435368 (145 KByte PDF)
MD5 Fingerprint: df9063865dbcc6467a52147e1a2a64c0
Erstellt am: 31.8.2012

Sinke, W. ; WIP - Renewable Energies, München; European Commission; UNESCO; World Council for Renewable Energy; International Photovoltaic Equipment Association:
24th European Photovoltaic Solar Energy Conference 2009. CD-ROM : The compiled State-of-the-Art of PV Solar Technology and Deployment. Proceedings of the International Conference held in Hamburg, 21-25 September 2009
München, 2009
ISBN: 3-936338-25-6
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <24, 2009, Hamburg>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()

In this paper we report about first results regarding laser fired contacts (LFC) on an optimized screen printed aluminum rear side layer and compare it with our “standard” LFC procedure on evaporated aluminum layers. First of all, the influence of the laser pulse energy, pulse duration and amount of pulses on the resistance of one contact is evaluated. Since this value depends strongly on the size of the contact also the recombination losses in the contact area have to be considered in order to compare and qualify LFC contacts comprehensively. We have achieved cell efficiencies > 18.0 % on industrial like processed wafers, which underlines the potential of this approach. Finally, a 20.5 % efficiency solar cell with an aerosol printed front metallization manufactured on laboratory scale is presented, which is the best value ever reported for solar cells with fired front and back side metallization.