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ECN publication
Impact of aluminum contamination in MC-Si solar cells
Bronsveld, P.C.P.; Geerligs, L.J.; Coletti, G.; Ovrelid, E.J.; Kvande, R.; Stokkan, G.; Olsen, E.
Published by: Publication date:
ECN Solar Energy 21-9-2009
ECN report number: Document type:
ECN-M--09-038 Conference Paper
Number of pages: Full text:
4 Download PDF  

Presented at: 24th European Photovoltaic Solar Energy Conference and Exhibition, Hamburg, Germany, 21-25 september 2009.

Ingots containing varying amounts of aluminum were compared by solar cell processing. The impact on cell performance was found to be related to the amount of Al. However, also counter intuitive results were obtained, in which a larger impact of the Al contamination on cell performance was observed for less Al and vice versa. Formation of harmful Al-O complexes, known to be responsible for Al-related minority carrier recombination, can qualitatively explain the differences between the cells, based on variations in the total oxygen content in the ingots. Possibly, competition between Al and B in the formation of oxygen complexes can also explain the improved cell performances in the presence of B.

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