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(a) Top view of a contact strip from module S1 consisting of 0.15 mm Cu-core with 15 μm SnPbAg solder coating. The region where it was pressed on by the back side of the cell lying on it starts about 2 mm from the left side. Scratches are visible. (b) Enlarged view of the contact region with scratches. (c) Enlarged top view of another contact strip, with visible scratches.
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