Cracks in Solar Cell Metallization Leading to Module Power Loss under Mechanical Loads

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 electrol...

Full description

Saved in:
Bibliographic Details
Published in:Energy procedia 2014, Vol.55, p.469-477
Main Authors: Käsewieter, Jörg, Haase, Felix, Larrodé, Marta Haro, Köntges, Marc
Format: Article
Language:English
Subjects:
crack width
mechanical loads
metallization
power loss
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 mΩ whereas the front finger resistance increases by 15.4 kΩ stepwise. 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 2μm has no influence on the resistances. Crack widths higher than 7μm 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.
ISSN:1876-6102
1876-6102
DOI:10.1016/j.egypro.2014.08.011