Helps Flexible Solar Panels Last Longer

Researchers at Holst Center and DuPont Dijing Film have developed a high-performance, low-cost roll-to-roll barrier solution specifically designed for flexible photovoltaic cells. This production-ready solution combines the advanced barrier technology of the Holst Center with the peelable clean surface film of DuPont's film. It helps to extend the production and service life of organic, perovskite and CIGS photovoltaic cells, opening the door to more affordable, environmentally friendly solar power generation.


Help and resist the energy of the environment

Flexible photovoltaic cells promise to embed clean energy power into building materials, vehicles and everyday items. They also offer the possibility of using a large-capacity roll-to-roll (R2R) production process, which can significantly reduce production costs. However, batteries are susceptible to moisture and atmospheric oxygen, so an impervious barrier is needed to protect sensitive films.

The Holst Center has extensive experience in developing moisture barrier solutions, including high performance flexible barriers for OLED displays. Although the moisture resistance of photovoltaic cells does not need to meet these challenging standards, its performance must be much higher than that required for sensors, electrophoretic displays, radio frequency interference displays, liquid crystal displays, and the like.

Provide high performance protection

One of the key elements in creating a good barrier film is to ensure that the inorganic barrier layer is deposited on a very clean surface, minimizing the number of defects caused by particles in the barrier layer. Typically, this is done by adding an organic coating to planarize the surface of the substrate prior to applying the barrier layer. However, this additional step increases the overall production cost of the barrier film and the commercial availability of the planned organic materials is still limited.

DuPont Teijin Film (DTF)'s peelable clean surface substrate, Melinex®PC, provides a clean substrate surface without the need for a planarization step or other cleaning process, saving time and cost in producing flexible photovoltaic cell barrier films. The cleaned substrate ensures optimal deposition of the barrier layer, requiring only an inorganic barrier to protect the photovoltaic cell.

Ready to put into commercial production

Over the past two and a half years, the solution has been optimized to achieve substrate-foil and barrier performance at production readiness levels. The Holst Center worked closely with DTF to develop a solution that has been able to manufacture barrier films in the thousands of square meters on the Rutes test line. Solliance successfully tested the package of the developed shielding solution for the CIGS (Cuingase 2) module. After 1000 hours of accelerated life testing (85 ° C - 85% relative humidity), the performance is still higher than 95% of the starting performance.

Denti senior process engineer Valentijn von Morgen said: "The experience gained with the Lyteus test line, coupled with the input of the Holst Center team, has enabled us to improve the performance of peelable clean surface films for the production of flexible photo-resistive wet films on a roll-by-roll basis. "We intend to bring this unique film to the market for large-scale production of barrier films and other flexible electronic products, and continue to develop plans to modify the performance of Melinex PCs to tailor films for different barrier applications and environments. ”

“Our goal is not only to develop innovative technologies, but also to develop market-specific solutions. Therefore, our single-layer barriers on peelable clean surface films developed for packaging flexible photovoltaic cells have been customized to meet market costs. /Performance requirements," said Pavel Kudlacek, senior researcher and project manager at Holst Center. Now, the entire solution is ready for mass production on an industry scale. ”