Certified by the authoritative US National Renewable Energy Laboratory (NREL), LONGi self-developed 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%, once again raising the efficiency ceiling for crystalline silicon modules. Both achievements were included in the 66th edition of the Solar Cell Efficiency Tables, signifying China's continued leadership in global PV technology.
LONGi announced two new global efficiency records at the Technology Innovation Session during the 2025 SNEC in Shanghai.
Tech Breakthroughs: World Records Redefine Industry Standards
At SNEC 2025, LONGi’s crystalline silicon-perovskite tandem solar cell achieved a groundbreaking 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. Simultaneously, the 26% efficiency of its back-contact (BC) modules demonstrates LONGi’s profound expertise in this technology, propelling crystalline silicon module efficiency toward the 27% threshold.
As a trailblazer in PV industry, LONGi has consistently driven technology innovation. From revolutionizing the industry by mainstreaming monocrystalline technology over polysilicon, to pioneering perovskite and BC solar cell research, the company has built an end-to-end R&D ecosystem spanning materials, equipment, and manufacturing processes.
“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.”
These weighty world records have been formally included in the 66th edition of the Solar Cell Efficiency Tables. Curated by Professor Martin Green – the “Father of Photovoltaics” – and a global panel of leading scientists, this authoritative benchmark has been published in Progress in Photovoltaics since 1993 and is recognized as the “gold standard” for tracking PV advancements.
Li Zhenguo, Founder of LONGi, VP of Central R&D Institute, and the company’s newly appointed CTO, delivered a keynote speech at LONGi booth during the 2025 SNEC in Shanghai.
Innovation Genes: From Cell Technology to Collaborative Ecosystems
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.”
A highlight at the exhibition was LONGi’s collaboration with Belgium’s Innoputs Solar Team on the solar race car “Infinite Apollo”. Equipped with LONGi’s latest BC solar cells and flexible encapsulation technology, the vehicle will compete in the Bridgestone World Solar Challenge (BWSC). This cross-sector partnership stands as an innovative archetype for “PV+ Transportation” applications, demonstrating technology’s limitless potential.
At 2025 SNEC, LONGi declares to the global community: Chinese PV enterprises are reshaping the industry landscape with technological prowess, accelerating the zero-carbon future. “Over the past 25 years, PV technology has made clean energy the world’s most economical power source,” Li declared on-site. “For the next 25, our mission is integrating green energy into life’s every detail. These records mark not just LONGi’s milestones – they are accelerants for global energy transition.”
