DAS Solar has achieved a significant new milestone as its independently developed Diamond series back-contact (DBC) module completed third-party verification by CPVT, delivering an output of 664.9W and a full-area conversion efficiency of 24.61%. This accomplishment follows the company’s certified 27.77% DBC cell efficiency announced in September, marking an additional breakthrough. Achieving new records at both the cell and module levels highlights DAS Solar’s fully integrated innovation capability—from advanced high-efficiency cell technologies to high-performance module development—further enriching the company’s technological roadmap and strengthening value creation for downstream partners and global customers.
The DBC 3.0 Plus module stands as a core achievement under DAS Solar’s “One Core, Three Branches” technology strategy. Built on TOPCon 5.0 tunneling layer technology combined with a fully passivated selective-contact architecture, the module reaches 24.61% efficiency in the standard 2382 × 1134 mm full-area format without the use of hidden busbars, tiling, multi-segmentation, or other auxiliary module enhancements. With additional optical and electrical optimization at the module level, along with high-density encapsulation, total module power is expected to exceed 680W.
DAS Solar’s progress in DBC technology traces back to 2020, during which the company has completed three major iterations from DBC 1.0 to DBC 3.0 Plus. The DBC 3.0 cell platform—responsible for the verified 27.77% efficiency—employs high-precision patterning and composite passivation layers to overcome long-standing industry challenges related to charge separation and selective carrier transport. The cells achieve an open-circuit voltage of 747mV, with pilot-line mass production data demonstrating an average efficiency of 27.6% and yields above 96%. Crucially, the technology is fully compatible with existing N-type TOPCon production lines, providing a practical solution to the industry’s efficiency–cost–scalability trade-off. The latest module efficiency record confirms the platform’s successful transition from laboratory research to mature industrial deployment, marking another step forward in DAS Solar’s technological evolution.
“Achieving new records in both DBC cell and module efficiency is the result of DAS Solar’s long-term commitment to scientific innovation and continuous investment in core photovoltaic technologies,” said Dr. Dengyuan Song, CTO of DAS Solar. “These results reinforce the strength of our R&D foundation and demonstrate the maturity, scalability, and commercial potential of our DBC platform.”
DAS Solar has established a comprehensive ecosystem for DBC technology development, spanning research and development, industry standardization, and intellectual property protection. As an active contributor to global photovoltaic standardization, the company has led or participated in more than 120 domestic and international PV standards. DAS Solar has also built a robust intellectual property portfolio consisting of over 100 core DBC-related patents and led the development of the “Zhejiang Manufacturing” standard for crystalline silicon back-contact solar cells, addressing a significant gap in industry guidelines and helping shape the technological direction of advanced PV manufacturing.
Supported by major scientific research initiatives—including Zhejiang Province’s “Spearheading and Leading” technology program and key research projects under the national “14th Five-Year Plan”—DAS Solar continues to intensify its efforts in advancing next-generation DBC cell and module technologies. Leveraging its extensive expertise in tunneling-passivation technology accumulated through TOPCon development, the company is now targeting future performance milestones of 28% cell efficiency and 25% module efficiency. With these advancements, DAS Solar aims to contribute to high-quality development across the photovoltaic industry and accelerate global progress in clean energy innovation.
