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  4. Ribbon interconnection of 6" BC-BJ Solar Cells
 
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2017
Journal Article
Title

Ribbon interconnection of 6" BC-BJ Solar Cells

Abstract
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 e for a 60 cell full size module.
Author(s)
Walter, Johann
Fraunhofer-Institut für Solare Energiesysteme ISE  
Rendler, Li Carlos  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Halm, Andreas
ISC Konstanz
Mihailetchi, Valentin
ISC Konstanz
Kraft, Achim  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Eitner, Ulrich
Fraunhofer-Institut für Solare Energiesysteme ISE  
Journal
Energy Procedia  
Project(s)
HERCULES  
Funder
European Commission EC  
Conference
International Conference on Crystalline Silicon Photovoltaics (SiliconPV) 2017  
Open Access
File(s)
Download (616.22 KB)
Rights
CC BY-NC-ND 4.0: Creative Commons Attribution-NonCommercial-NoDerivatives
DOI
10.24406/publica-r-250956
10.1016/j.egypro.2017.09.287
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • 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

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