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Tongwei’s latest THC-G12 series module adopts 0BB copper-based cell-to-cell interconnection technology
The cells used in the module incorporate fine copper line-based grid lines
The company has received an authoritative certification from TÜV Rheinland for this module
Vertically integrated PV cell and module maker Tongwei Solar unveiled its latest THC-G12 series HJT module on the first day of SNEC 2026.
The module measures 2,384 × 1,303 mm (L × W), is made of 198 triple-cut (1/3) G12 (210 × 210 mm) cells (THC), and boasts a maximum power output of 802.43 W and an efficiency of up to 25.83%. This represents an absolute power gain of 11.63 W and an efficiency gain of 0.37 percentage points, compared to its predecessor’s 790.8 W power and 25.46% efficiency (see Tongwei Solar Sets a New Record with THC-G12 HJT Module, Reaching 790.8W).
The company attributes these improvements to both cell and module-level advancements. On the cell side, the company has adopted back-surface polishing of the wafer to reduce surface contaminants and defects, which later act as charge carrier recombination centers and affect cell efficiency. In terms of cell metallization, the grid lines are narrow copper print lines, an alternative to silver. While the company’s press release didn’t disclose the aspect ratio of the grid lines, it describes them as ‘ultra-fine’. This indicates that the narrow, uniform copper grid lines reduce shadowing on the cell, thereby allowing more photons to reach it. Also, the edges of the laser-cut cells are passivated to mitigate the risk of charge carrier recombination along the edges, which the company describes as ‘edge optimization’.
The major highlight at the module level is the adoption of busbarless (0BB) copper ribbon-based cell-to-cell interconnection technology. Instead of collecting current via busbars, the 0BB architecture enables direct current collection from gridlines, helping in accumulating higher current. Meanwhile, the use of copper interconnection makes the module 100% silver-free. The module’s active area ratio was also maintained at a high level; however, details on the cell-to-cell gap or the technology used to increase active area were not shared at the time of publishing. Also, the multi-cut cell (1/3) technology reduces the current travel path and reduces power losses, contributing to module power gain.
The company received TÜV Rheinland certification for this module at the event.
Its commercial availability was unknown at the time of this article’s publication.
