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Title:
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Ultrasonic welding; a connection technology for flexible thin film modules
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Author(s):
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Published by:
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Publication date:
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ECN
Solar Energy
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1-6-2004
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ECN report number:
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Document type:
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ECN-RX--04-058
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Conference Paper
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Number of pages:
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Full text:
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3
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Download PDF
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Presented at: 19th European Photovoltaic Solar Energy Conference and Exhibition, Paris, France, 7-11 juni 2004.
Abstract:
Commercial ultrasonic welding equipment has been modified in such a
way that it is applicable to flexible foils. Individual welding parameters,
such as force, time and amplitude are optimised for the electrical connection
of CISCuT (CuInS2 on Cu-Tapes) solar cells.
By fine-tuning the ultrasonic welding force, we succeeded in making
stable and reproducible connection between aluminium tape and the front
contact respectively the copper back contact. As busbar material aluminium
and copper metals have been tested. Outside the welding area no material
changes were observed. Ultrasonic welding and encapsulation of the foils
have not influenced the solar cell performance. The measured contact
resistance is very low (<4 m. on 1.5 mm2 contact area). It is possible
to weld several tapes on short distances. Thermal cycling between -40°C
and 80°C or 85%/85°C damp/heat exposure do not influence the electrical
contact at the weld.
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