The certified result, confirmed by ESTI on 14 July 2026, extends a run of gains that has taken LONGi from 34.85 to 35.5 percent in under a year.
LONGi has reached a conversion efficiency of 35.5 percent with its independently developed crystalline silicon-perovskite tandem solar cell, certified by the European Solar Test Installation (ESTI). The figure, presented on 14 July 2026, marks a new world record for the technology.
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Crystalline silicon-perovskite tandem cells are the mainstream route toward next-generation high-efficiency devices, with a theoretical limit of up to 43 percent. That ceiling sits well above the Shockley-Queisser limit of 33.7 percent, which caps conventional single-junction cells.
The latest figure continues a steady sequence of certified gains. LONGi’s Central Research Institute recorded 33.9 percent in November 2023 and 34.6 percent in June 2024, before advancing from 34.85 percent through 35.2 percent to the current result in less than a year.
LONGi Solar: modules and storage from a single source
In May 2026, the company’s two-terminal tandem cell efficiency of 35.2 percent entered the 68th edition of the Solar Cell Efficiency Tables, compiled by the group led by Professor Martin Green at the University of New South Wales in Australia. On areas closer to industrial dimensions, the cell reached 34.3 percent on 261 cm² and 32.2 percent on 274 cm². LONGi’s tandem modules achieved 31.4 percent and 29.4 percent, both certified by independent international institutions and listed in the same tables.
LONGi organises its cell development as a tiered pipeline, keeping one generation in mass production while the next is already in development and a further generation is held in reserve. The structure allows the team to translate successive laboratory gains into certified results at cell and module level, and it supports the transition of crystalline silicon-perovskite tandem technology from the laboratory toward industrial manufacturing. (hcn)
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