World’s Most Efficient Solar Panel Ever

 700 W back-contact PV panel with world record silicon solar cell by Longi company of China 

Chinese solar manufacturer Longi unveiled a new PV module with 25.9% efficiency at the 2025 SNEC trade show in Shanghai, produced using both low- and high-temperature passivation techniques. Longi has introduced a ground breaking new solar module featuring industry-leading efficiency and power output. The panel delivers an impressive 700W power output and 25.9% module-level efficiency.

Chinese solar module manufacturer Longi unveiled a new solar module product which uses the company’s proprietary hybrid interdigitated back contact (HIBC) crystalline silicon solar cell based on a full-size silicon wafer, which reached a world-record power conversion efficiency of 27.81% in mid-April. Built on a full-size silicon wafer, the new panel offers a power density of 259 W/m² and a low temperature coefficient of -0.24%/°C, making it highly efficient even in hot climates.

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.

Longi says the HIBC cells are manufactured using advanced low- and high-temperature passivation on the front side and feature a dense polymer moisture barrier for durability. The company also highlighted a new “one-line welding structure” on its Tairay wafer, aimed at improving crack resistance. “This sets a new benchmark for photovoltaic performance,” Longi said, emphasizing that the design combines innovations in both cell architecture and materials. 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 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 said. “This opens a new frontier for enhancing module power density and sets a benchmark for the next generation of photovoltaic performance.”