DAH Solar’s Full-Screen Technology Demonstrates 11% Energy Gain for Solar PV Modules As frameless PV modules are gradually becoming a mainstream trend in the industry, PV magazine had an interview with DAH Solar’s R&D Director, Dr. Jiang Chengyin, about the company’s design for its 3.0 Full-Screen product version further improves energy yield while lowering costs and reducing the likelihood of fractures. What is the “Full-Screen” technology for solar modules? Dr. Jiang Chengyin: Regular solar modules have frames that protrude above the glass surface, causing dust to accumulate since rainwater can't flow off quickly. Through our patented design, we ensure the frame is flush with the surface, allowing rainwater to smoothly run off and carry away dust, achieving a self-cleaning effect. Based on outdoor performance tests, at an installation angle of around 5 degrees, which simulates the typical installation angle on most domestic color steel tile roofs, our Full-Screen modules can achieve an annual energy gain of approximately 11%. With the elimination of traditional aluminum frame wrapping, can the Full-Screen's flat edge design meet structural rigidity requirements? How does it withstand long-term outdoor sealing performance? Dr. Jiang Chengyin: Originally, double-glass modules had no frames. With encapsulation of double-sided strengthened glass fully meeting the module's strength requirements. Adding frame designs primarily protected glass edges from damage. Since the distance from the internal cell's conductive part to the module edge is generally over 15 mm, the waterproof sealing insulation width at the edge is also 15 mm, ensuring long-term outdoor sealing. DAH Solar's design eliminates the front frame but retains side and back frames, bonded with high-strength silicone rubber, maintaining glass edge protection. Silicone rubber offers proven durability and weather resistance. What improvements does DAH Solar's Full-Screen product at this SNEC exhibit offer compared to previous models? Dr. Jiang Chengyin: Our Full-Screen product has advanced to version 3.0, which is a significant improvement over versions 1.0 and 2.0. First, we have adopted the Full-Screen plus “Dense Busbar” (DBB), which is a design similar to 0BB. DBB technology has several advantages, notably significantly reducing silver consumption during cell production, lowering product costs. Additionally, in module production, we've abandoned high-temperature welding processes, using low-temperature film to bond ribbons to cell surfaces. This low-temperature encapsulation process enhances module power, reduces virtual welding and the likelihood of fractures, improves yield, and extends product life by avoiding flux residues that corrode grid lines. Overall, version 3.0 products show significant improvements in reliability and power generation compared to past versions. Furthermore, we now use industry-leading rectangular silicon wafers based on 182 mm as the substrate for TOPCon ce...
2023-09-06
A new record! The mass production conversion efficiency of DAH Solar's TOPCon cells has reached 26.05%!
The mass production average conversion efficiency of TOPCon cells (PE-poly route) exceeded 26%! On September 3rd, with the superposition application of SE (Selective Emitter) laser doping technology, the mass production average conversion efficiency of DAH Solar TOPCon cells, has reached 26.05%, refreshing the industry record once again, reaching the industry leading level, showing the "DAH speed".
On June 9, DAH Solar and SHENZHEN S.C issued the joint announcement, that DAH Solar's TOPCon cells manufacturing base set the climbing record of 97% yield and 25.4% efficiency in just 23 days (not on SE at that time), which attracted high attention from the whole industry.
Subsequently, through the continuous optimization of each technical links and materials, by the end of July, the mass production average conversion efficiency of DAH Solar’s TOPCon cells has reached 25.8%. At the beginning of September, with the equiped of laser SE equipment and technology, the conversion efficiency improved by another 0.25%, creating an industry-leading level by 26.05%.
DAH Solar has always focused on R&D and organization development.Not only in terms of module and PV system product innovation, we have successfully launched the global patent Full-Screen PV module and the world's first integrated PV system SolarUnit, and also forward-looking developand layout of cells technology, with absolute advantages to achieve the full production of TOPCon cells and the high-speed climbing of conversion efficiency and yield.
In addition to that, DAH Solar has also precipitated for many years in terms of crystal pulling and slicing technology, laying a good foundation for further improving the layout of industrial integration.