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20%-Efficient Rear Side Passivated Solar Cells in Pilot Series Designed for Conventional Module Assembling

: Mohr, A.; Engelhart, P.; Klenke, C.; Wanka, S.; Stekolnikov, A.; Scherff, M.; Seguin, R.; Tardon, S.; Rudolph, T.; Hofmann, M.; Stenzel, F.; Lee, J.; Diez, S.; Wendt, J.; Schmidt, S.; Müller, J.W.; Wawer, P.; Hofmann, M.; Saint-Cast, P.


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>
Conference Paper
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Industrielle und neuartige Solarzellenstrukturen; Produktionsanlagen und Prozessentwicklung

In the Reiner Lemoine Research Line at Q-Cells a pilot series fabrication of double-side contacted mono-crystalline solar cells using a dielectric passivated rear side with local metal contacts was implemented. A few hundred of such large area (156 mm x 156 mm) high efficiency solar cells were fabricated on boron doped Cz silicon material per week. Median efficiencies of up to 20% before light-induced degradation are reached. The best large area solar cell has an efficiency of 20.2% after deactivation the light induced degradation due to the boron-oxygen complex. The efficiency is independently confirmed by Fraunhofer ISE and demonstrates the high potential of this cell structure even under production like conditions. The R&D cell development of the passivated rear side was supported by a cooperation work with Fraunhofer ISE. In this paper we present R&D results of the cooperation work with Fraunhofer ISE and Q-Cells continuous technical improvements of the mono-crystalline solar cell process in the pilot series fabrication, which also included testing of quality and reliability of these R&D cells integrated into modules.