Cracks in solar cell metallization leading to module power loss under mechanical loads

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Kasewieter, J.; Haase, F.; Larrodé, M.H.; Köntges, M.: Cracks in solar cell metallization leading to module power loss under mechanical loads. In: Energy Procedia 55 (2014), S. 469-477. DOI:

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Sum total of downloads: 110

We investigate the mechanisms leading to electrically insulated cell parts in a photovoltaic module under mechanical load. For this we measure the resistances across a crack in a laminated solar cell during bending that is typical in the field. The cracks in the solar cell are detected with electroluminescence imaging. The resistance over the aluminum paste increases continuously by negligible 30 mΩwhereas the front finger resistance increases by 15.4 kΩstepwise. This difference is the result of the higher ductility of the aluminum paste in comparison to the front finger metallization. We associate the steps in the front finger resistance measurement to breakage of single fingers with an equivalent circuit model. Furthermore we found that a silicon crack widths lower 2 μm has no influence on the resistances. Crack widths higher than 7 μm leads to a complete front finger interruption. We determine that the specific resistance of such a crack causes nearly 100% of the power loss, which is caused by a completely electrically insulating crack in a photovoltaic module.
License of this version: CC BY-NC-ND 3.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2014
Appears in Collections:An-Institute

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pos. country downloads
total perc.
1 image of flag of Germany Germany 75 68.18%
2 image of flag of United States United States 16 14.55%
3 image of flag of China China 5 4.55%
4 image of flag of No geo information available No geo information available 4 3.64%
5 image of flag of Vietnam Vietnam 2 1.82%
6 image of flag of Czech Republic Czech Republic 2 1.82%
7 image of flag of Taiwan Taiwan 1 0.91%
8 image of flag of Netherlands Netherlands 1 0.91%
9 image of flag of Mexico Mexico 1 0.91%
10 image of flag of France France 1 0.91%
    other countries 2 1.82%

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