Recently, Tongwei Global Innovation R&D Center showcased its latest technological breakthrough: an ultra-high bifacial solar module based on Tunnel Oxide Passivated Contact (TOPCon) technology. The module has achieved a cell bifaciality exceeding 94.3% (certified by TÜV Rheinland, Germany), a module bifaciality of 91.7%, and a module power output of up to 722W. This achievement has been extensively reported by the globally renowned photovoltaic industry media PV Magazine, demonstrating the strong potential of TOPCon technology and leading the development direction of TOPCon technology in the field of high-efficiency bifacial modules.

Tongwei Global Innovation R&D Center

The key to this technological breakthrough lies in two innovative designs. The rear-side selective sunken pyramid structure optimizes the texture design of the cell's rear area, significantly enhancing light capture capability while effectively reducing parasitic infrared absorption losses, making photoelectric conversion more efficient. The "zebra-crossing" passivation contact technology utilizes a multi-layer composite passivation design, significantly improving the passivation performance of the rear side, further enhancing the cell's power generation efficiency.

Meng Xiajie, Head of Cell Development at Tongwei Co., Ltd.'s PV Technology Center, revealed that Tongwei has initiated trial production of modules exceeding 90% bifaciality, with plans for mass production of modules above 85% bifaciality this year. It is expected that the mass production technology goals of 95% cell bifaciality and 90% module bifaciality may be achieved within the next 1-2 years. This advancement not only helps to further reduce the per-watt power generation cost of modules but also promotes the widespread application of high-bifaciality TOPCon technology in the global photovoltaic market.

As a leading global photovoltaic enterprise, Tongwei insists on technological innovation and deeply promotes industry-university-research cooperation. The research findings, titled "Enabling 95% bifaciality of efficient TOPCon solar cells by rear-side selective sunken pyramid structure and zebra-crossing passivation contact," has been officially published in the international renowned academic journal Solar Energy Materials and Solar Cells. The paper was completed through collaboration between Tongwei and the research team from Southwest Petroleum University.

Link of the article: https://doi.org/10.1016/j.solmat.2025.113809