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Status of FolMet technology: How to produce PERC cells more cheaply than Al-BSF cells

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By Jan Frederik Nekarda, Martin Graf, Oliver John, Sebastian Nold, Henning Nagel, Dirk Eberlein, Achim Kraft, Rico Böhme, André Streek & Ralf Preu, Fraunhofer Institute for Solar Energy Systems ISE, Freiburg; Innolas-Solutions GmbH, Krailling; Laserinstitut Mittweida, Mittweida, Germany

R&D activities related to solar cell production technology generally aim for higher cell efficiencies and lower production costs in order to decrease the levelized cost of electricity (LCOE). Today the passivated emitter
and rear cell (PERC) is poised to become the preferred state-of-the-art cell architecture. ‘FolMet’ technology – a new metallization and contacting upgrade – therefore has particular relevance to PERC gains.

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This issue of Photovoltaics International focuses on the steady adoption of PERC as the technology of choice for providing a quick boost to cell performances. Our chief analyst, Finlay Colville, reports that PERC is a key driver for internal technology roadmaps of all silicon cell providers and is indirectly influencing the development of other technologies in competing n-type and thin-film segments. However, PERC is not without its drawbacks, and one of these is its increased susceptibility to light-induced degradation. Other highlights include ISC Konstanz on the future of back-contact technology and ECN on the development of a new technique for minimising recombination losses in silicon solar cells.

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