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Ribbon interconnection of 6" BC-BJ Solar Cells

: Walter, Johann; Rendler, Li Carlos; Halm, Andreas; Mihailetchi, Valentin; Kraft, Achim; Eitner, Ulrich

Volltext urn:nbn:de:0011-n-4774977 (616 KByte PDF)
MD5 Fingerprint: 607a0e04705fb6dd4044a3e5497aa50f
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Erstellt am: 2.2.2018

Energy Procedia 124 (2017), S.504-514
ISSN: 1876-6102
International Conference on Crystalline Silicon Photovoltaics (SiliconPV) <7, 2017, Freiburg>
European Commission EC
FP7-Energy; 608498; HERCULES
High efficiency rear contact solar cells and ultra powerful modules
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ISE ()
photovoltaisches Modul; Systeme und Zuverlässigkeit; Photovoltaik; Photovoltaische Module und Kraftwerke; Modultechnologie; Modulcharakterisierung; Gebrauchsdauer- und Schadensanalyse; BC-BJ; cell; solar module; ribbon; bending process; solar cell; PV solar module; wave-shaped ribbon; wave bending process

This work presents an interconnection approach for 6” back-contact back-junction (BC-BJ) solar cells by using conventional solder-coated copper ribbons with implemented wave structures for thermomechanical stress relief. We developed a process for production and advanced mechanical and electrical characterization for these interconnectors. In our study, mechanical stress is reduced up to 96.6 % (for ribbons) and up to 81 % (for wires) compared to non-structured interconnectors. In electrical terms, the relative effective resistance of the interconnector is increased by 3.1 % (for ribbons) and by 6.4 % (for wires). In general both, ribbons and wires, are suitable for the interconnection of 6” BC-BJ solar cells.
A 4-cell module with 19.94 % efficiency in a standard module setup with 21.09 % - 21.18 % 6” BC-BJ ZEBRA cells (CTMpower = -3.8 %) is manufactured. For interconnection 8 modified ribbons (1.5 x 0.2 mm²) are used on the rear side. The cells feature a multilayer metallization with a low temperature paste. The module passes TC-200 according to IEC 61215 without degradation. Our cost analysis shows that such a stress relief structure can be realized with additional material costs of lower than 0.2 € for a 60 cell full size module.