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Silicon solar cells using aluminum foil as rear side metallization reaching 21.0 % efficiency

: Nekarda, J.-F.; Lottspeich, F.; Wolf, A.; Preu, R.

Fulltext urn:nbn:de:0011-n-1567684 (264 KByte PDF)
MD5 Fingerprint: d30f500cdb6e240c49a3f9a0a98f651b
Created on: 10.8.2012

European Commission:
25th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2010. Proceedings : 5th World Conference on Photovoltaic Energy Conversion, 6-10 , September 2010, Valencia, Spain
München: WIP-Renewable Energies, 2010
ISBN: 3-936338-26-4
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <25, 2010, Valencia>
World Conference on Photovoltaic Energy Conversion <5, 2010, Valencia>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Pilotherstellung von industrienahen Solarzellen; Industrielle und neuartige Solarzellenstrukturen

In this contribution we present the latest results of our experiments regarding the use of aluminum foil as rear side metallization for solar cells with dielectric passivation and laser fired contacts (LFC). In this approach the foil is fixed during the contacting process onto the wafer by local alloying of an IR laser. The proof of that concept was already shown at the 22nd EUPVSEC conference in Milan. Meanwhile, we have optimized the overall cell process by using aluminum oxide Al2O3 since it is a more appropriate passivation material for this approach. Furthermore, we investigated the laser process and compared different laser parameters regarding the resistance of the contacts and the adhesion properties of the foil. Finally, we show that the efficiency potential of the foil metallization is on the same level compared to the originally metallization concept for LFC cells based on physical vapor deposition (PVD) by achieving efficiencies of 21.0 %.