LONGi Pushes Silicon Limits with Record-Breaking Tandem and Back-Contact Technologies
By Tina Dasgupta – 17th June 2025
At the SNEC 18th (2025) International Photovoltaic Power Generation and Smart Energy Conference & Exhibition, LONGi announced two significant technological advancements. The company unveiled its self-developed large-area (260.9 cm²) crystalline silicon–perovskite two-terminal tandem solar cell, which achieved an impressive 33% conversion efficiency, certified by the U.S. National Renewable Energy Laboratory (NREL), marking a new global record. In addition, its back-contact (BC) module surpassed 26% efficiency, both feats recognized in Version 66 of the Solar Cell Efficiency Tables, showcasing China’s ongoing progress in photovoltaic technology.
At SNEC 2025, LONGi’s crystalline silicon–perovskite tandem solar cell reached a groundbreaking 33% efficiency on a 260.9 cm² area, representing the first time this efficiency has been achieved at a mass-producible scale. This breakthrough signifies a major advancement towards reducing photovoltaic energy costs. Simultaneously, LONGi’s back-contact (BC) modules reached 26% efficiency, bringing crystalline silicon module performance closer to the 27% threshold.
As a leader in the photovoltaic industry, LONGi has been at the forefront of innovation, transitioning from popularizing monocrystalline technology to advancing perovskite and BC solar cells, all supported by a robust R&D ecosystem encompassing materials, equipment, and manufacturing.
“LONGi’s innovative spirit is deeply rooted in a respect for technological fundamentals,” stated Li Zhenguo, Founder of LONGi, President of its Central R&D Institute, and the company’s newly appointed CTO. “We not only focus on our own breakthroughs but also promote collaborative innovation.”
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/longi-sets-new-standards-in-solar-technology-with-record-tandem-and-back-contact-cell-efficiencies/
