The Fraunhofer Institute for Solar Energy Systems ISE and teamtechnik, an international leader in production technology, report that it is now possible to connect high efficiency solar cells using electrically conductive adhesives in series production. The results of the joint research project »KleVer« show that the adhesive technology is ready for the market and can be used as an alternative to the widespread soft soldering interconnection technology. Due to the much lower process temperatures of this technology compared to soldering, temperature-sensitive high efficiency solar cells can be connected using adhesives in a gentle and material-saving process.
In industrial production, the throughput is only slightly lower than with soldering. The reliability of the adhesive connection was confirmed in tests carried out in a climate chamber.
»In the last few years, we were able to greatly expand our expertise in connecting solar cells using electrically conductive adhesives and test this process on the laboratory scale. With the stringer unit, we were then able to further optimize the lead-free interconnection technology on the industrial scale,« explains Dr. Achim Kraft, project manager and team head of Interconnection Technologies at Fraunhofer ISE. Axel Riethmüller, project manager and Chief Operating Officer of teamtechnik, is also pleased:
»As manufacturer of high performance stringers, we are proud to hold a front position in connecting technology for temperature-sensitive heterojunction solar cells on an industrial scale through the development of this unit. We already have first orders coming in for the new stringers using this adhesive technique. This would not have been possible without the joint project with Fraunhofer ISE.«
Within the »KleVer« project, a stringer with an adhesive unit was successfully put in operation and tested. On this unit, it was demonstrated that solar cells as full or half-cells with three, four or five busbars could be connected using electrically conductive adhesives at a throughput of ca. 1600 cells per hour. The power of the heterojunction modules manufactured up to now with the adhesive technology is 320 watts for a standard size of 60 cells.
The process temperature of this technology remains below 180°C, avoiding damage to the hetero layers of the cells. This type of cell, which currently holds the lead in efficiency, cannot be soldered conventionally at temperatures over 200°C. Using adhesives greatly reduces the thermal and mechanical stresses in the cell, resulting in lower material tension.
Therefore, the danger of micro cracks and breakage occurring is also reduced. The cycle time for cell interconnection in the teamtechnik stringer is less than 2.3 seconds and is primarily determined by the hardening time of the adhesive material used.
The »KleVer« project was financially supported by the German Federal Ministry for Economic Affairs and Energy BMWi.
Short Profile: teamtechnik Maschinen und Anlagen GmbH
The teamtechnik Maschinen und Anlagen Gmbh is one of the international market leaders for innovative production technology, assembly and functional test systems. The company, based in Freiberg, Germany, focuses on developing custom automation solutions for the automative, solar and medical technology, in which it is a recognized technology leader. Founded in 1976, teamtechnik now has production sites in Germany, Poland, China and in the United States. With over 1000 employees worldwide, the systems manufacturer achieves a turnover of €170 million.
Karin Schneider | Fraunhofer-Institut für Solare Energiesysteme ISE
Nano-scale process may speed arrival of cheaper hi-tech products
09.11.2018 | University of Edinburgh
Nuclear fusion: wrestling with burning questions on the control of 'burning plasmas'
25.10.2018 | Lehigh University
Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.
Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.
When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure
Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...
19.11.2018 | Event News
09.11.2018 | Event News
06.11.2018 | Event News
19.11.2018 | Materials Sciences
19.11.2018 | Information Technology
19.11.2018 | Life Sciences