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Tabbing-stringing quality control challenges

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By Dr. Harry Wirth, Dept. Materials Research and Applied Optics, Fraunhofer Institut für Solare Energiesysteme (ISE), Freiburg, Germany

Cell interconnection is recognized as the most critical process with respect to module production yield. If the process is not carefully controlled, cell cracking and subsequent breakage may occur. Many manufacturers promise breakage rates below 0.3-0.5% on their tabber-stringers, which applies for cells above 160-180µm thickness that are free from initial cracks. In real production, this figure strongly depends on materials, process parameters and throughput. This paper outlines some approaches that should be taken to avoid high levels of breakage in the cell interconnection process.

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The ninth edition of Photovoltaics International was published in August 2010. It features Fraunhofer IISB looking at advanced process control techniques in Cell Processing, NREL gives an atmospheric thin-film deposition technique overview, and in Power Generation REC looks at reducing BOS costs with new technology and economies of scale.

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