Sat Nov 22 10:40:00 UTC 2025: Summary:

Longi, a Chinese solar manufacturer, has released a scientific paper detailing the technology behind their 27.81% efficient hybrid interdigitated back-contact (HIBC) solar cell, which was unveiled in April. The cell utilizes passivated tunneling contacts, dielectric passivation layers, and both n-type and p-type contacts. The paper explains the various techniques used, including optimized surface treatments, laser-induced crystallization, and in-situ edge passivation, all of which contribute to the cell’s high performance. Longi believes these techniques can be scaled for heterojunction (HJT) solar cell manufacturing and sees potential for further improvements by reducing contact resistivity.

News Article:

Longi Unveils Secrets Behind Record-Breaking Solar Cell in New Scientific Paper

Shanghai, China – [Date – Today’s Date] – Chinese solar giant Longi has shed light on the technology behind its groundbreaking 27.81% efficient hybrid interdigitated back-contact (HIBC) solar cell, revealed earlier this year, in a new scientific paper published last week in Nature.

The paper, authored by Longi’s research team, including founder Li Zhenguo, details the innovative design of the cell, which combines passivated tunneling contacts, dielectric passivation layers, and both n-type and p-type contacts. The company highlighted several key advancements, including optimized surface treatments, laser-induced crystallization, and in-situ edge passivation, as crucial for achieving the record-breaking efficiency.

“By redesigning both the cell architecture and material systems, we achieved simultaneous breakthroughs in optical management and carrier transport efficiency,” Longi representatives told pv magazine in April. The full details of these processes were revealed this week with the release of the paper.

According to the publication, the HIBC cell achieves a short-circuit current of 5,698 mA, an open-circuit voltage of 744.9 mV, and a fill factor of 87.55% on a 133.63 cm2 active surface. The company believes the technology is readily scalable for use in heterojunction (HJT) solar cell manufacturing, paving the way for even more efficient and cost-effective solar energy solutions.

While the HIBC cell has already demonstrated exceptional performance, Longi aims to refine the technology even further. The company believes that reducing contact resistivity, particularly in the p-type contact, offers significant potential for further improvements.

The unveiling of Longi’s scientific paper marks a significant step forward in solar technology and underscores the company’s commitment to driving innovation in the renewable energy sector. The advancements detailed in the paper promise to accelerate the development of more efficient and affordable solar power for the world.

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