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Failure mechanisms for solar cells with laser doped selective emitter and plated Ni-Cu metal contacts

: Hördt, W.; Geisler, C.; Hopman, S.; Bartsch, J.; Mondon, A.; Glatthaar, M.; Kluska, S.

Fulltext urn:nbn:de:0011-n-3155776 (452 KByte PDF)
MD5 Fingerprint: d72031cd77a2cfc133ceeb7ca2675fd2
Created on: 2.12.2014

Bokhoven, T.P. ; European Commission:
29th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2014 : Proceedings of the international conference held in Amsterdam, The Netherlands, 22 - 26 September 2014, DVD
München: WIP, 2014
ISBN: 3-936338-34-5
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <29, 2014, Amsterdam>
Conference Paper, Electronic Publication
Fraunhofer ISE ()
Solarzellen - Entwicklung und Charakterisierung; Silicium-Photovoltaik; Dotierung und Diffusion; Kontaktierung und Strukturierung; Herstellung und Analyse von hocheffizienten Solarzellen; doping; Emitter; chemical processing; contacts; Ni-Cu

Al-BSF solar cells with a laser doped selective emitter and plated Ni-Cu contacts are an attractive approach for industrial fabrication. Yet the contact adhesion of the plated Ni-Cu contacts due to diffusion barriers in the contact area and electrical stability against tempering induced non-ohmic Ni shunts are two main challenges for this cell concept. This work presents failure mechanisms of laser doped solar cells. Microscopic characterization analyzes process induced defects separately, which result in poor contact adhesion and non-ohmic shunting. A process route is presented, which yields in solar cells with pseudo fill factors above 80 % and a sufficient contact adhesion of 1 N/mm.