Fraunhofer ISE scientists have identified the best metallization pastes to help reduce contact resistivity and contact recombination in p-type TOPCon solar cells. They applied a silicon nitride layer through plasma-enhanced chemical vapor deposition onto both sides of a cell.
The pandemic and accidents at polysilicon labs in China’s Xinjiang region put PV manufacturers under pressure to maintain production this year, while slowing cell and module R&D. After half-cut and multi-busbar becomes commonplace, manufacturers will continue to explore the high-density assembly methods that emerged last year, as well as n-type cells. But the market is also shifting to large formats, and the share of bifacial products is growing this year. As sizing up modules can bring immediate returns, PV InfoLink’s Amy Fang expects the PV industry to prioritize the development of large formats and bifacial products next year.
Scientists in Saudi Arabia have developed a new passivation process for n-type silicon solar cells, which they say could offer a simpler, lower-cost alternative to current processes used in manufacturing. The group fabricated wafers using this process with promising results, and now plans to integrate the process into a full silicon cell.
Several manufacturers recently brought average mono PERC cell efficiency to 22.5%, and efficiencies will likely go beyond 22.6% in the second half of this year. This suggests that p-PERC cell efficiency could be brought closer to that of n-type, making it more difficult for n-type cells to compete in the increasingly challenging market. Taking costs and market conditions into account, most manufacturers have slowed their capacity expansion plans, leading to a gap between actual output and production capacity. PV InfoLink’s Wells Wang sheds some light on n-type trends in 2020.
The Chinese manufacturer has claimed a world record for a large-size, contact-passivated solar cell. The result, certified by Germany’s Institute for Solar Energy Research in Hamelin, betters the company’s previous record by almost 0.6%.
Longi has also joined the 500 W-plus module club with its new Hi-Mo5 product, while Sunport has announced to expand production of its MWT module.
Chinese manufacturer Jolywood claims it has reached 23.5% cell efficiency on the production lines for its n-type TOPCon technology. The achievement, which has not been verified by a third party, represents a 0.3% improvement to Jolywood’s reported mass production efficiency.
A Dutch research team has used highly transparent, hydrogenated nanocrystalline silicon oxide layers to improve the optoelectrical performance of contact stacks in a silicon heterojunction device. The material is said to offer superior electrical as well as favorable optical properties.
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