TopCon solar cells

DAH Solar says it wants to reach 5.5 GW of TOPCon solar module capacity by the end of this year. Ronma Solar, meanwhile, says it wants to build an 18 GW panel factory in Jinhua, in China’s Zhejiang province.

The China Academy of Metrology and Science has certified Jolywood’s 26.7% efficiency rating for an n-type tunnel oxide passivated contact (TOPCon) solar cell, which the company claims is a world record. In November 2022, it announced a 26.1% efficiency rating for a similar cell.

Zhang Yingbin, Trina Solar’s head of global product strategy, speaks to pv magazine about the path to a supply chain dominated by n-type TOPCon products. He says Trina Solar will reach 30 GW of TOPCon solar module capacity by the end of 2023.

Scientists from Germany’s Fraunhofer ISE and US panel maker Solaria have applied thermal laser separation and post-metallization passivated edge technology to tunnel oxide passivated contact (TOPCon) cell production. They have developed shingle PV devices that are more efficient than cells built with conventional laser scribing and mechanical cleaving methods.

Chinese researchers have developed a new passivation technique for shingled solar panels based on tunnel oxide passivated contacts (TOPCon) or heterojunction (HJT) tech. It reduces recombination losses in the cell-to-module process and reportedly increases open-circuit voltage, fill factor, and efficiency.

Chinese module maker JinkoSolar has released three new TOPCon solar panel variants, ranging in power from 445 W to 635 W. The most efficient modules have a rating of 23.23%. The bifacial factor is up to 85% across the three panel types, with a temperature coefficient of -0.29% C.

The second-phase launch of Solarspace’s $1.47 billion manufacturing facility brings its total global production capacity of n-type solar cells to 35 GW.

Jochen Rentsch, head of department at Fraunhofer ISE, speaks to pv magazine about recent progress in TOPCon module development, including new efficiency records by JinkoSolar and Jolywood. Production costs are falling as more Tier 1 companies shift from PERC to TOPCon, and multi-gigawatt production is already a reality. Could the TOPCon solar cell segment reach a tipping point for efficiency in 2023?

Scientists in Germany have improved the efficiency of an industrial TOPCon solar cell from 23.8% to 24.1% by using laser-enhanced contact optimization as a post-firing treatment.

Scientists in Australia have looked at how gettering technologies could improve passivating contacts based on polysilicon and silicon monoxide (SiOx) for tunnel oxide passivated contact (TOPCon) solar cells. They found that the gettering strength of the P-doped poly mainly depends on the doping concentration.