LONGi Pushes Silicon Limits with Record-Breaking Tandem and Back-Contact Technologies

At the SNEC 18th (2025) International Photovoltaic Power Generation and Smart Energy Conference & Exhibition, LONGi announced two major technological breakthroughs. Its self-developed large-area (260.9 cm²) crystalline silicon–perovskite two-terminal tandem solar cell achieved a 33% conversion efficiency, certified by the U.S. National Renewable Energy Laboratory (NREL), setting a new global record. Meanwhile, its back-contact (BC) module surpassed 26% efficiency, with both achievements recognized in Version 66 of the Solar Cell Efficiency Tables, highlighting China’s continued advancement in photovoltaic technology.

At SNEC 2025, LONGi’s crystalline silicon–perovskite tandem solar cell reached a record-breaking 33% efficiency on a 260.9 cm² area, marking the world’s first achievement of this level at mass-producible scale and signaling a major step toward lowering photovoltaic energy costs. At the same time, its back-contact (BC) modules achieved 26% efficiency, advancing crystalline silicon module performance closer to the 27% threshold. As a pioneer in the PV industry, LONGi has led innovation from popularizing monocrystalline technology to advancing perovskite and BC solar cells, supported by a comprehensive R\&D ecosystem across materials, equipment, and manufacturing.

“LONGi’s innovation genes stem from reverence for technological fundamentals,” said Li Zhenguo, Founder of LONGi, President of its Central R&D Institute, and the company’s newly appointed CTO. “We focus not only on our own breakthroughs but champion collaborative innovation.”