Longi unveils 700 W back-contact PV panel with world record silicon solar cell
Chinese solar manufacturer Longi has unveiled a new PV module with 25.9% efficiency, produced using both low- and high-temperature passivation techniques.
June 16, 2025 Vincent Shaw
Image: Vincent Shaw, pv magazine
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Longi has unveiled a new solar module that utilises the company’s proprietary hybrid interdigitated back contact (HIBC) crystalline silicon solar cell based on a full-size silicon wafer, and reached a world-record power conversion efficiency of 27.81% in mid-April.
The company said the 2,382 mm x 1,134 mm module offers 25.9% efficiency and 700 W power output, with a power density of 259 W/m². The temperature coefficient is -0.24%/C.
Longi said the cells are manufactured using both low- and high-temperature passivation on the front side. It added that the cell design features an “advanced” moisture barrier with a densely cross-linked polymer matrix.
“The Tairay wafer uses a one-line welding structure with improved any-cracking performance,” Longi Chairman Zhong Baoshen said, without providing further details.
In April, the company said its Central Research Institute independently developed the record-setting HIBC cell.
“By redesigning both the cell architecture and material systems, we achieved simultaneous breakthroughs in optical management and carrier transport efficiency,” a spokesperson told pv magazine at the time. “This opens a new frontier for enhancing module power density and sets a benchmark for the next generation of photovoltaic performance.”
Back-contact solar cells, known for high efficiency and compatibility, have led efficiency rankings since SunPower’s 20.3% record in 2007 using interdigitated back contact (IBC) technology. BC technology has achieved eight consecutive world records in crystalline silicon module efficiency over the past 30 years
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