LONGi has announced two technological milestones, as part of the recent SNEC 2025 event.
Certified by the US National Renewable Energy Laboratory (NREL), LONGi's large-area (260.9 cm²) crystalline silicon-perovskite two-terminal tandem solar cell achieved a conversion efficiency of 33%, setting a new global efficiency record for large-area tandem cells. Simultaneously, the efficiency of its back-contact (BC) module surpassed 26%, raising the efficiency ceiling for crystalline silicon modules. Both achievements were included in the 66th edition of the Solar Cell Efficiency Tables.
LONGi’s crystalline silicon-perovskite tandem solar cell achieved 33% efficiency on an ultra-large area of 260.9 cm² through material innovation and structural optimization. This marks a nearly 20% efficiency gain over single-junction silicon solar cells and represents the world’s first 33% efficiency milestone at mass-producible dimensions – paving a new path for reducing photovoltaic energy costs.
“LONGi’s innovation genes stem from reverence for technological fundamentals,” stated Li Zhenguo, Founder of LONGi, Vice 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.”
Li Zhenguo, Founder of LONGi, VP of Central R&D Institute, and the company’s newly appointed CTO, delivered a keynote speech at the LONGi booth during the 2025 SNEC in Shanghai.
At the new starting point of its 25th anniversary, LONGi unveiled a dual-engine “Innovation + Collaboration” strategy: intensifying R&D in frontier fields like BC, perovskite, and hydrogen energy while building an open innovation ecosystem with global partners. As Li Zhenguo stated, “The era of photovoltaics as a dominant energy source has arrived, yet challenges like energy storage and grid integration remain. Only through collaborative innovation can clean energy truly benefit everyone.”
Li emphasized, “Whether pushing the limits of single-junction silicon solar cells or advancing next-gen tandem technologies, LONGi embraces multiple technological pathways with an open mindset. Today’s dual breakthroughs epitomize our relentless commitment to R&D and efficiency frontiers. We will continue driving PV to become the world’s primary energy source.”
