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ECN publication
Climate chamber test results of MWT back contact modules
Published by: Publication date:
ECN Solar Energy 6-9-2010
ECN report number: Document type:
ECN-M--10-007 Conference Paper
Number of pages: Full text:
4 Download PDF  

Presented at: 25th European Photovoltaic Solar Energy Conference and Exhibition - 5th World Conference on Photovoltaic Energy Conversion, Valencia, Spain, 6-10 september 2010.

Large, 6x10 cells back contact modules have been manufactured at ECN using multi-crystalline Sunweb® metallization wrap through (MWT) cells manufactured at Solland Solar, a conductive back sheet foil and conductive adhesive as interconnection material. The modules have been exposed to thermal cycling and damp heat tests according to IEC61215 ed. 2 requirements. For one set of materials, modules passed 300 thermal cycles and 2000 hours of damp heat exposure. Wet leakage tests performed after 1000 hrs and 2000 of damp heat exposure and with an applied voltage of 1000 V yield an insulation resistance of 670 M??m2 and 180-320 M??m2 respectively. This is well beyond the specification of 40 M??m2, proving the insulation of this type of module is more than sufficient. This shows that the MWT module concept using conductive adhesive as interconnection is robust. The reliability depends on the combination of materials used, as modules using other materials show failure after 1000 hrs of damp heat exposure. By further understanding the degradation mechanisms involved, stability of the module concept can be improved. IEC qualification testing of these MWT modules has started.

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