LONGi Green Energy Technology (LONGi)
Founded in 2000, LONGi Green Energy Technology Co., Ltd. (LONGi) is a solar technology that develops solutions for large-scale power plants and for different industries and households with its innovation-focused development. Eventually, it also plans to supply "Green Power + Green Hydrogen" solutions for global zero-carbon development.
Since 2015, LONGi has located its operations in Yunnan, China, and Kuching, Malaysia, to utilize the abundant local hydropower resources to provide clean energy for its facilities. LONGi plans to integrate solar power plants with pumped storage in areas that feature significant elevation differences and abundant sunlight, creating an industrial model for using solar.
On its website, LONGi states that "the LONGi R&D team has achieved successive breakthroughs in key technologies. These include perovskite thin-film crystal growth on textured silicon substrates, high-efficiency bulk passivation and optical management, and these advancements have led to rapid improvements in the efficiency of silicon-based stacked cells".
LONGi has set successive world records for perovskite-silicon tandem solar cells built on commercial CZ silicon wafers, reaching a certified 35.5% - results verified by the German Fraunhofer Institute for Solar Energy Systems and the European Solar Test Installation.
Contact information for LONGi Green Energy Technology (LONGi)
No.8369 Shangyuan Road, Economic And Technological Development Zone
Xi'an
Shaanxi Sheng
China
New interfacial design pushes perovskite-silicon tandem cells past 2.01 V open-circuit voltage at 34.0% efficiency
Researchers at Soochow University, LONGi Green Energy Technology, and Xi'an Jiaotong University have developed a nanoscale interfacial scaffold that pushes a perovskite-silicon tandem solar cell to 34.0% power conversion efficiency, with an open-circuit voltage of 2.014 V - independently certified, and among the highest voltages reported for this cell architecture.
The design integrates discrete zirconium dioxide (ZrO2) nanoparticles with a self-assembled monolayer (SAM) at the buried interface, creating what the team calls a "dual-anchored" architecture. Through field-effect passivation, the ZrO2 nanoparticles suppress non-radiative recombination at the interface while leaving the SAM's charge-extraction pathways intact - addressing a common tradeoff in these devices, where interfacial passivation layers that reduce defects often also add resistance or block carrier transport.
LONGi to build 100 MW silicon-perovskite tandem pilot production line in Shaanxi
LONGi Green Energy has reportedly filed a public environmental impact assessment announcement for a new "Novel Crystalline Silicon-Perovskite Tandem Solar Cell Technology and Equipment Industrialization Project," confirming plans to invest 204 million yuan (about $28 million) in a 100 MW pilot production line for high-efficiency silicon-perovskite tandem solar cells in Xixian New Area, Shaanxi Province.
According to the announcement, the project is classified as a modification and will occupy roughly 4,000 square meters within the existing plant of LONGi's previously registered Phase I Pilot Project at its Central Research Institute. Rather than building new facilities from scratch, LONGi will use the leased factory space and supporting infrastructure already in place, installing key equipment such as perovskite thin-film deposition systems, perovskite rapid crystallization tools and functional-layer thin-film deposition equipment to support R&D and pilot-scale testing of the tandem cells.
Novel asymmetric self-assembly molecule enables efficient perovskite/silicon tandem solar cells
Researchers from LONGi Green Energy Technology, the Hong Kong Polytechnic University (PolyU), Soochow University, Beijing University of Technology, Chinese Academy of Sciences and the University of Science and Technology of China have tackled the challenge of achieving ordered and uniformly covered self-assembly monolayers (SAMs) with optimal packing configuration on textured silicon substrates, for improving the efficiency of perovskite/silicon tandem solar cells.
The team designed an asymmetric SAM (named as HTL201), featuring anchoring group and spacer flanking a carbazole core, serving as hole selective layer (HSL) for perovskite/silicon tandem solar cells. When compared to symmetric SAMs with nitrogen-bonded phosphonic acid group, the HTL201 molecule reportedly exhibited minimized steric hindrance and improved coverage on the transparent conductive oxide (TCO) recombination layer.
LONGi announces new solar cell efficiency record of 33% for large-area silicon-perovskite 2T tandem solar cell
LONGi has announced two technological milestones, as part of the recent SNEC 2025 event.
Certified by the US National Renewable Energy Laboratory (NREL), LONGi's 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%, raising the efficiency ceiling for crystalline silicon modules. Both achievements were included in the 66th edition of the Solar Cell Efficiency Tables.
Perovskite/silicon tandem solar cells with bilayer interface passivation achieve PCE of 33.89%
Researchers at The Hong Kong Polytechnic University (PolyU) recently announced a novel bilayer interface passivation strategy to develop tandem solar cells that achieved a record-high PCE of 33.89%.
Interfacial recombination at the perovskite/electron transport layer interface has long been considered a major obstacle to enhancing the efficiency of perovskite/silicon tandem solar cells. Prof. YIN Jun, Assistant Professor of the Department of Applied Physics at PolyU, and his research team recently made a breakthrough in interface engineering towards addressing this critical challenge. They integrated advanced material design and a device optimization strategy to develop high-efficiency perovskite/silicon tandem devices. This research was conducted in partnership with LONGI Green Energy Technology and Soochow University.
