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18.7% Emitter Wrap-Through Silicon Solar Cells With Screen-Printed Silver Contacts Acting as a Barrier for Evaporated Aluminium Metallization

: Fallisch, A.; Werner, S.; Retzlaff, M.; Neubauer, R.; Lottspeich, F.; Biro, D.

Volltext urn:nbn:de:0011-n-2210723 (291 KByte PDF)
MD5 Fingerprint: 10c3f88dbe099741484733d6a1551711
Erstellt am: 7.12.2012

European Commission:
26th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC. Proceedings : 5th to 9th September 2011 at the CCH - Congress Centre and International Fair Hamburg in Germany
München: WIP-Renewable Energies, 2011
ISBN: 3-936338-27-2
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <26, 2011, Hamburg>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Produktionsanlagen und Prozessentwicklung

Since earlier EWT cells with an evaporated aluminium metallization suffered from an inability of providing annealing, a screen-printed silver finger is used to contact the emitter. This silver finger hinders the evaporated aluminium layer, which is used for the laser-fired contacts, from reducing the pseudo fill factor in a final annealing step. The pseudo fill factor is thereby increased up to over 80% leading to conversion efficiencies up to 18.2% on FZ silicon using an emitter with a sheet resistance of 60 /sq. Front and rear side are passivated in a short oxidation step. This reduces the phosphorus concentration at the surface while simultaneously increasing the conductivity of the emitter. Furthermore it is shown, that a single side polishing step after the laser damage removal and texturization process approves to be beneficial for the open-circuit voltage. By using a standard POCl3 diffusion process conversion efficiencies up to 18.7% are achieved on FZ silicon.