Longi(SH:601012) 中国能源报·2025-11-13 10:05Core Viewpoint - Longi Green Energy has achieved significant breakthroughs in photovoltaic technology, as evidenced by two groundbreaking research results published in the prestigious journal "Nature," showcasing the company's advancements in cutting-edge technology [1][6]. Group 1: Breakthroughs in Photovoltaic Technology - On November 10, 2025, Longi Green Energy, in collaboration with research teams from Suzhou University and Xi'an Jiaotong University, announced a major advancement in silicon-based tandem solar cells. The efficiency of their ultra-thin crystalline silicon-perovskite tandem cell was certified at 33.4% by the National Renewable Energy Laboratory (NREL), while the commercial-sized flexible tandem cell achieved an efficiency of 29.8% certified by Fraunhofer ISE. This marks the world's first and only certified efficiency record for flexible crystalline silicon-perovskite tandem cells [3]. - On November 12, 2025, Longi Green Energy, in collaboration with teams from Sun Yat-sen University and Lanzhou University, published research on hybrid back-contact structure (HIBC) solar cells. The HIBC cell achieved a record efficiency of 27.81% and a fill factor of 87.55%, both setting new world records. This innovative technology combines the advantages of high-temperature polycrystalline and low-temperature amorphous silicon, representing a significant advancement in silicon solar cell technology [5][8]. Group 2: Technical Innovations and Challenges - The HIBC solar cell addresses key challenges in back-contact structures, such as achieving optimal passivation performance and minimizing contact resistance. The team developed innovative techniques, including laser-induced localized crystallization and in-situ edge passivation, to enhance the performance of the solar cells. These advancements significantly reduce contact resistance and suppress carrier recombination at the edges, thereby improving overall efficiency [8][16]. - The tandem solar cell technology leverages the advantages of both semiconductor materials, significantly increasing theoretical efficiency. The research demonstrated that ultra-thin silicon wafers, when reduced to a thickness of a few tens of micrometers, can maintain structural integrity under bending, thus meeting the demands for lightweight and flexible devices. The team achieved nearly 30% power conversion efficiency with a 60-micrometer thick ultra-thin tandem device, which can be folded with a bending radius of 1.5 centimeters [16][17].