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Reliability of electrically conductive adhesives

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By Dr. Oreski; Dr. Gabriele Eder; Lukas Neumaier; Dr. Christina Hirschl; Dr. Rita Ebner; Jörg Scheurer; Wolfgang Pranger

The application of electrically conductive adhesives (ECAs) is a promising alternative to the soldering process for cell interconnection in today’s solar module production. ECAs provide an environmentally friendly solution and offer several other advantages over the conventional solder interconnection technology, such as lower processing temperature, higher mechanical flexibility and replacement of toxic lead. When it is proposed to switch from soldering to adhesive technology in a critical process such as the production of solar cell strings, it is necessary to perform a thorough preliminary analysis of the properties of the materials involved, the material compatibilities and the long-term stability of the interconnections within the PV modules.

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With a recent spate of new solar cell records announced for PERC-based architectures pushing conversion efficiencies past 24%, it is a good time to reflect on the pioneering work at SolarWorld – the first to commercialise and ramp PERC to volume production. A special in-depth paper from former members of SolarWorld’s R&D and manufacturing team should be a compelling read and a leading reference paper in the future. Adding to the PERC-based theme is the paper from ISC Konstanz, providing further real world insight into achieving manufacturability of nPERT cells with conversion efficiencies approaching 23%.

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