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Front-side metallization by parallel dispensing technology

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By Maximilian Pospischil, Fraunhofer Institute for Solar Energy Systems ISE, Freiburg; Markus Klawitter, Fraunhofer Institute for Solar Energy Systems ISE, Freiburg; Martin Kuchler, Fraunhofer Institute for Solar Energy Systems ISE, Freiburg; Raphael Efinger, Fraunhofer Institute for Solar Energy Systems ISE, Freiburg; Angel Padilla, Fraunhofer Institute for Solar Energy Systems ISE, Freiburg; Harald Gentischer, Fraunhofer Institute for Solar Energy Systems ISE, Freiburg; Markus König, Heraeus Deutschland GmbH & Co. KG, Hanau; Matthias Hörteis, Heraeus Deutschland GmbH & Co. KG, Hanau; Lars Wende, ASYS Automatisierungssysteme GmbH, Dornstadt, Germany; Florian Clement, Fraunhofer Institute for Solar Energy Systems ISE, Freiburg; Daniel Biro, Fraunhofer Institute for Solar Energy Systems ISE, Freiburg; Ralf Preu, Fraunhofer Institute for Solar Energy Systems ISE, Freiburg

Parallel dispensing technology as an alternative front-side metallization process for silicon solar cells offers the possibility of increasing cell conversion efficiency by 2% rel. by the use of commercial silver pastes designed for screen-printing technology. This efficiency gain is achieved through a significantly reduced finger width, and hence reduced shading losses, in combination with substantially improved finger homogeneities and high aspect ratios that guarantee sufficient grid conductivity at reduced paste lay-down. In this paper Fraunhofer ISE’s development of a parallel dispensing unit that is integrated into an industrial, inline-feasible platform made by ASYS is discussed. A possible industrial application of the dispensing technology is supported by latest results from pilot processing as well as by basic economic considerations

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Photovoltaics International Archive
Forecasting the evolution of a young, dynamic industry is by definition an uncertain business, and solar is no exception. Rarely, if ever, do the numbers broadcast by any of the various bodies involved in the PV prediction game tally, and even historical deployment rates remain the subject of hot debate. The paradox is that getting forecasts broadly right is going to become increasingly important over the next few years, particularly for those involved in producing the equipment that will support whatever levels of demand come to pass. As discussed by Gaëtan Masson, director of the Becquerel Institute, on p.110 of this issue of Photovoltaics International, although global PV demand appears in rude health, complex political and economic conditions in many individual markets mean the question of how vigorously it will continue to grow in the coming years is less than clear. Yet for the upstream part of the industry, correctly forecasting PV market developments will be critical to ensure the right investments are made along the value chain in technologies that will help spur PV to new levels of competitiveness and thus drive continued demand.

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