July 14, 2026 – At the 2026 Solar and Energy Storage Innovation Conference, LONGi officially announced that its independently developed crystalline silicon-perovskite tandem solar cell has achieved a conversion efficiency of 35.5%, certified by the European Solar Test Installation (ESTI), once again setting a new world record.
Crystalline silicon-perovskite tandem solar cells represent the mainstream technology route for next-generation ultra-high-efficiency solar cells, with a theoretical efficiency limit of up to 43% – far exceeding the Shockley–Queisser limit of 33.7% for single-junction cells. Through sustained technological breakthroughs, LONGi’s tandem cell team lifted the efficiency to 33.9% in November 2023 and further to 34.6% in June 2024. In less than a year since then, the team has achieved a series of successive advances, moving from 34.85% to 35.2%, and now to 35.5%, clearly demonstrating the R&D strength and spirit of exploration at LONGi’s Central Research Institute.
In May this year, LONGi’s independently developed two-terminal crystalline silicon-perovskite tandem cell efficiency (35.2%) was included in the 68th edition of the Solar Cell Efficiency Tables published by the team led by Professor Martin Green at the University of New South Wales, Australia, marking a representative high-level achievement for this technology route at the time. Meanwhile, under conditions closer to industrial-scale dimensions, LONGi achieved conversion efficiencies of 34.3% (261 cm²) and 32.2% (274 cm²), highlighting the promising industrialization prospects of tandem technology. Furthermore, LONGi’s tandem modules delivered conversion efficiencies of 31.4% and 29.4%, both independently certified by authoritative international institutions and included in the efficiency tables, further strengthening the foundation for moving crystalline silicon-perovskite tandem technology from the lab to industrial application.
Driven by its leading technological innovation capabilities, LONGi has established a tiered R&D system of “one generation in mass production, one in development, and one in reserve,” continuously advancing technological breakthroughs and high-quality development in clean energy. Looking ahead, LONGi will remain focused on technological leadership, delivering iterative breakthroughs to contribute the innovative strength of a Chinese enterprise to the global energy transition.
About LONGi
As a global leader in green energy technology, LONGi drives innovation across solar, energy storage, and hydrogen—three core pillars of a fully integrated clean energy system. We deliver safe, affordable, and sustainable energy solutions to customers worldwide. Committed to sustainable development, LONGi works to make clean energy accessible and affordable for all. By seamlessly connecting green power generation, energy storage, and hydrogen production, we enable end-to-end clean energy coverage—from generation and storage to consumption—building a truly inclusive and accessible clean energy ecosystem.
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