Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Industrial Maturity of Electrically Conductive Adhesives for Silicon Solar Cells Demonstrated

25.04.2018

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.


The conductive adhesive paste is applied using a screen printing mask

© Fraunhofer ISE


Solar cells with three, four or five busbars can be interconnected in the adhesive stringer

© Fraunhofer ISE

»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.

Weitere Informationen:

https://www.ise.fraunhofer.de/en

Karin Schneider | Fraunhofer-Institut für Solare Energiesysteme ISE

More articles from Power and Electrical Engineering:

nachricht New efficiency world record for organic solar modules
12.11.2019 | Forschungszentrum Juelich

nachricht Using mountains for long-term energy storage
12.11.2019 | International Institute for Applied Systems Analysis (IIASA)

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Magnets for the second dimension

If you've ever tried to put several really strong, small cube magnets right next to each other on a magnetic board, you'll know that you just can't do it. What happens is that the magnets always arrange themselves in a column sticking out vertically from the magnetic board. Moreover, it's almost impossible to join several rows of these magnets together to form a flat surface. That's because magnets are dipolar. Equal poles repel each other, with the north pole of one magnet always attaching itself to the south pole of another and vice versa. This explains why they form a column with all the magnets aligned the same way.

Now, scientists at ETH Zurich have managed to create magnetic building blocks in the shape of cubes that - for the first time ever - can be joined together to...

Im Focus: A new quantum data classification protocol brings us nearer to a future 'quantum internet'

The algorithm represents a first step in the automated learning of quantum information networks

Quantum-based communication and computation technologies promise unprecedented applications, such as unconditionally secure communications, ultra-precise...

Im Focus: Distorted Atoms

In two experiments performed at the free-electron laser FLASH in Hamburg a cooperation led by physicists from the Heidelberg Max Planck Institute for Nuclear physics (MPIK) demonstrated strongly-driven nonlinear interaction of ultrashort extreme-ultraviolet (XUV) laser pulses with atoms and ions. The powerful excitation of an electron pair in helium was found to compete with the ultrafast decay, which temporarily may even lead to population inversion. Resonant transitions in doubly charged neon ions were shifted in energy, and observed by XUV-XUV pump-probe transient absorption spectroscopy.

An international team led by physicists from the MPIK reports on new results for efficient two-electron excitations in helium driven by strong and ultrashort...

Im Focus: A Memory Effect at Single-Atom Level

An international research group has observed new quantum properties on an artificial giant atom and has now published its results in the high-ranking journal Nature Physics. The quantum system under investigation apparently has a memory - a new finding that could be used to build a quantum computer.

The research group, consisting of German, Swedish and Indian scientists, has investigated an artificial quantum system and found new properties.

Im Focus: Shedding new light on the charging of lithium-ion batteries

Exposing cathodes to light decreases charge time by a factor of two in lithium-ion batteries.

Researchers at the U.S. Department of Energy's (DOE) Argonne National Laboratory have reported a new mechanism to speed up the charging of lithium-ion...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

High entropy alloys for hot turbines and tireless metal-forming presses

05.11.2019 | Event News

Smart lasers open up new applications and are the “tool of choice” in digitalization

30.10.2019 | Event News

International Symposium on Functional Materials for Electrolysis, Fuel Cells and Metal-Air Batteries

02.10.2019 | Event News

 
Latest News

Magnets for the second dimension

12.11.2019 | Machine Engineering

New efficiency world record for organic solar modules

12.11.2019 | Power and Electrical Engineering

Non-volatile control of magnetic anisotropy through change of electric polarization

12.11.2019 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>