Rotary screen printing boosts cycle times

Metallization of a silicon wafer by means of rotary screen printing in a demonstrator.
Fraunhofer ISE

Currently, flatbed screen printing is the standard process used for the metallization of silicon solar cells and many other electronic components. Using a new production machine developed jointly with ASYS Automatisierungssysteme GmbH, researchers at the Fraunhofer Institute for Solar Energy Systems ISE have now managed to increase the print throughput by a factor of 1.5. In order to achieve this, rotation screen printing and flexographic printing were used for the first time. With the new machine, the research team achieved a cycle time of just 0.6 seconds per solar cell.

The new process can also be used for functional printing in the areas of hydrogen technology, sensor technology and power electronics.
Visitors to the LOPEC 2022 (March 23–24, 2022, International Congress Center Munich) can learn about the concept at the research institute’s booth (FO.10).

Dr. Florian Clement, Head of Department Production Technology – Structuring and Metallization, Printing Technology at Fraunhofer ISE, explains the reason for the interest in this research: “Metallization by screen printing is currently limited to a throughput of approximately 0.9 seconds per solar cell and line. This makes the printing step a bottleneck in the production process of silicon solar cells as well as in the printing process of single components in many other industries.”

In order to step up the throughput in the metallization process, a project consortium under the joint leadership of ASYS Automatisierungssysteme GmbH and Fraunhofer ISE has developed a demonstrator machine for the high-throughput metallization of silicon solar cells and other electronic components. In a proof-of-concept demonstration, it was shown that the print process throughput can be increased by a factor of 1.5. “The machine has the technical potential to double the throughput compared to screen printing machines,” explains Dr. Andreas Lorenz, project manager at Fraunhofer ISE.

The new machine features a newly developed high-throughput transport system, in which the components for printing are transported on autonomous shuttles at high speed and with precision through rotary printing units produced by Gallus Ferd. Rüesch AG, a Swiss machine engineering company which is part of Heidelberger Druckmaschinen AG. Finest structures can be printed directly on the components. Depending on the specific requirements, a flexographic printing or a rotary screen printing unit can be used for the printing process. The modular system design also facilitates other printing and coating processes such as multi-nozzle dispensing or gravure printing.

The potential applications of the new system extend far beyond the metallization of silicon solar cells. While the overwhelming majority of printing and coating systems on the market operate on the roll-to-roll printing principle and are thus limited to web-based substrates, this system addresses the high-throughput printing of unit-load components such as solar cells, printed circuit boards, chip cards and a multitude of other components.

The process and machine were developed in the Rock-Star and Rock-IT research projects and funded by the Federal Ministry of Education and Research (BMBF) and the Federal Ministry for Economic Affairs and Climate Action (BMWK, formerly BMWi).

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Dr. Florian Clement:

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Christina Lotz Kommunikation
Fraunhofer-Institut für Solare Energiesysteme ISE

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