At the 21st Conference on Photovoltaic Science and Technology (CPVC-21) held recently, DAS Solar shared its latest technological milestone: a certified 27.77% conversion efficiency for its next-generation DBC (back-contact) solar cell. The announcement was made during a keynote academic presentation by Mr. Kangping Zhang, General Manager of DAS Solar's Central Research Institute.

During his presentation titled "Strengthening the TOPCon Foundation and Expanding DBC Pathways: A Multidimensional Approach to PV Innovation and Commercialization", Zhang revealed that DAS Solar's latest DBC cell has achieved an industry-leading efficiency of 27.77%, with the open-circuit voltage reaching an impressive 745.7 mV, as verified by CPVT.

The result is the proprietary DBC platform, which has evolved from version 1.0 to the current DBC 3.0 Plus, which reflects the company's ongoing effort since 2020 to integrate its advanced SiO₂/Poly-Si passivated contact structure into the rear side of the cell, effectively merging TOPCon with back-contact architectures. Based on N-type silicon substrates and TOPCon 5.0 architecture, the latest generation features symmetrical passivated contacts on both the N- and P-regions. A series of proprietary process improvements have enabled DAS Solar to overcome several technical bottlenecks, paving the way for commercial-scale manufacturing.

Zhang also outlined five key innovations behind the DBC 3.0 Plus upgrade, which incorporates high-precision laser patterning to enable finer and denser contact grids, an embedded diode design that improves hot-spot protection and energy yield, a hybrid passivation scheme using composite films to enhance full-area P/N junction performance, 0BB interconnection technology to reduce silver paste usage while optimizing material-cell structure compatibility, and Black silicon surface texturing which boosts resistance to UVID. Together, these breakthroughs have made DAS Solar's DBC platform not only one of the most efficient on the market but also reliable, cost-effective, and ready for high-volume manufacturing.

On the module side, additional enhancements such as concealed layout, lossless current collection, and uniform thermal field control during soldering have improved performance consistency. Modules offer excellent weak-light response (over 95%) and demonstrate strong environmental adaptability and long-term system stability.

During the event, DAS Solar also joined other leading organizations in co-initiating a statement of intent calling for deeper industry-academia collaboration, technical diversification, supply chain innovation, and accelerated global standard alignment to promote the high-quality development of the PV industry. The company reaffirmed its long-standing commitment to innovation-driven growth. With a core focus on N-type technologies, DAS Solar is actively advancing a multi-track R&D roadmap covering TOPCon, DBC, TSiP, and SFOS, forming a robust matrix of high-performance solar solutions.

Looking ahead, DAS Solar will continue expanding its global footprint while enhancing technology-industry integration through joint research, scenario-based product development, and strategic partnerships. The company remains dedicated to delivering reliable, high-efficiency products and contributing to the global energy transition through continuous innovation.