javascript:void(0) In the international photovoltaic market, the "carbon footprint" label has received great attention, and low-carbon footprint products are widely popular. Compared with metallic silver, copper has the characteristics of low carbon emissions and low cost, which can effectively reduce the carbon footprint. Based on this, this article reports a horizontal double-sided Copper metallisation technology. This technology can not only metallize the front and back sides of various types of silicon solar cells at the same time, but also has fast speed, good uniformity, and simple process, making it suitable for the industrial mass production of solar cells. This article describes the structure and manufacturing process of TOPCon solar cells patterned with ultrashort pulse laser and metallized using this novel horizontal double-sided copper metallisation technology. In this batch, average efficiency reached above 26%.