DEK Solar and the Hamelin Institute of Solar Energy (ISFH) collaborated to improve the industry's crystalline silicon solar cells by using a screen-printed metal contact electrode on the back of the battery and a two-step screen/steel screen printing process on the front. In this case, the back-passivation battery or PERC) conversion efficiency, and set a record of 21.2%.
In general, the efficiency of screen printing solar cells ranges from 17.5% to 19.5%, but this latest research and development result - the use of metallization technology for screen printing and stencil printing - has created a new world record for PERC battery conversion efficiency. .
A number of DEK Solar technologies, including the high-precision Eclipse metallization equipment platform, ultra-fine grid wire mesh and precision wire mesh, contributed to a record-breaking 21.2% battery efficiency. The battery utilizes Heraeus optimized front metallized silver paste while using the two-step printing process provided by DEK Solar to complete the front metallization. First, the main grid printing was completed using the five main grid electrode design of DEK Solar Precision Mesh, and then the fine grid lines of 46 μm width were printed with DEK Solar's ultra-fine grid line stencil.
DEK Solar's ultra-fine grid wire stencils guarantee excellent print uniformity and aspect ratio, and can provide excellent fine line smoothness and uniformity at a fine grid width of 40 μm. Accurate control of the relative printing heights of the main grid and fine grid lines not only reduces shading losses, saves silver paste costs, but also enables the use of non-contact main grid slurries to increase open circuit voltage (Voc), thereby improving cell efficiency. The back metal contacts are printed using DuPont backyard aluminum paste.
"The importance of this achievement should not be underestimated," explains Tom Falcon, chief engineer at DEK Solar. “The study of ISFH and DEK Solar effectively provided the solution sought by the solar market: through screen and stencil printing, the most cost-effective metallization process was used to produce highly efficient, industrialized crystalline silicon back passivation. This is indeed a major breakthrough for the global solar industry."
Dr. Thorsten Dullweber, leader of the ISFH research group's solar cell production process, also pointed out the importance of this efficiency increase and the contribution of DEK Solar: "It is not a trivial achievement to increase efficiency so significantly - especially when considering that this is the use of silk. Mesh and stencil printing methods are achieved at a consumption of less than 80 mg of silver paste per wafer.DEK Solar has been and will continue to be an important partner of ISFH, providing not only advanced equipment, stencils and wire meshes. , also provide endless process knowledge."
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