Breakthrough Achieved: Over 31% Efficiency in 210mm Industrial-Scale Solar Cells

For the first time globally, a battery efficiency exceeding 31% has been achieved in the 210mm industrial-grade battery size!
Event Details:

• The 7th Perovskite and Tandem Battery Technology Forum will take place on April 16-17, 2025, in Changzhou.
• Experts from Canadian Solar will present on the latest developments in perovskite four-terminal tandem modules.
• Experts from JA Solar will discuss the efficiency and stability challenges in perovskite/silicon tandem batteries.
• Leaders from Trina Solar will cover the development trends in perovskite tandem technology.
• Experts from Tongwei will share advancements in the mass production technology for commercial-size perovskite-silicon tandem batteries and modules.
• Leaders from LONGi Green Energy will present on AI-enabled R&D and industrialization of perovskite: Innovative practices in high-throughput equipment.

According to information released by Trina Solar on April 10, 2025, the National Key Laboratory of Photovoltaic Science and Technology at Trina Solar has announced a new record in perovskite crystalline silicon tandem technology. Their independently developed 210mm large-area perovskite/silicon tandem solar cell has received third-party independent certification from the Fraunhofer Institute for Solar Energy Systems (Fraunhofer ISE, CalLab), achieving a maximum battery efficiency of 31.1%. This not only establishes a new world record for large-area tandem solar cell efficiency but also marks the first time a battery efficiency exceeding 31% has been achieved in the 210mm industrial-grade battery size. This achievement represents the 32nd world record and signifies a comprehensive breakthrough for Trina Solar in perovskite crystalline silicon tandem technology.
The latest results are based on Trina Solar’s self-developed 210×105 mm² large-area high-efficiency crystalline silicon solar cell, which serves as the bottom cell for the tandem battery preparation. The research and development team utilized a fully mass-producible process, focusing on overcoming key technologies such as large-area film formation on textured substrates, top and bottom cell matching, and interface passivation to minimize optical losses. Following the achievement of a maximum battery efficiency of 34.2% for small-area cells in 2024, Trina Solar has made significant advancements in efficiency for large-area tandem cells.
For over a decade, Trina Solar has focused on breaking through the theoretical efficiency “ceiling” of crystalline silicon technology, initiating an “efficiency revolution” that accelerates the industrialization of next-generation battery technologies represented by perovskites. The theoretical efficiency limit of 30% is considered the barrier for crystalline silicon materials, while perovskite tandem technology can surpass the physical efficiency limits of single-junction cells, with potential theoretical efficiencies exceeding 43%. This technology not only offers greater enhancement potential compared to crystalline silicon but also boasts diverse application scenarios in fields such as BIPV (Building-Integrated Photovoltaics), BAPV (Building-Applied Photovoltaics), and BTPV (Building Photovoltaic Applications).
The tandem battery technology overcomes the efficiency limits of single-junction crystalline silicon cells, representing a key direction in advancing to a new development stage. Gao Jifan, Chairman and CEO of Trina Solar and Director of the National Key Laboratory of Photovoltaic Science and Technology, stated that Trina Solar is focusing on large-area mass-producible processes. They have developed the largest known industrial-grade tandem battery, following last month’s announcement of the world’s first photovoltaics product surpassing 800W in power within industrial standard dimensions. This achievement marks another breakthrough in perovskite crystalline silicon tandem technology, and the company is confident in achieving further technological advancements and leading the industry from the crystalline silicon era into the era of perovskite tandem technology.
Conference Schedule:

• April 16, 2025
• 08:25 – Opening remarks
• 08:30 – AI-Enabled R&D and Industrialization: Innovative Practices in High-Throughput Equipment by Dr. Fan Bin, Chairman of Longi Green Energy
• 08:50 – Progress and Challenges in Perovskite Photovoltaic Industrialization by Professor Tan Hairen, Founder of Nanjing University/Renshuo Energy
• 09:10 – Coating Challenges and Solutions for Perovskite Industrialization by Mr. Tang Tao, Deputy General Manager of Shenzhen Manster Technology Co., Ltd.
• 09:30 – Application Issues and Solutions for Perovskite Deposition Equipment by Mr. Shi Ge, General Manager of Yingkou Jincheng Machinery Co., Ltd.
• …
• 18:10 – Dinner

Registration Information:

• Team Ticket: 2900 CNY per person for groups of three or more.
• Standard Ticket: 3200 CNY per person.
• Location: Changzhou Zhongwu Hotel, 2nd Floor, Longcheng Hall (1899 Zhongwu Avenue, Zhonglou District, Changzhou).
• Check-in: April 15, 2025, from 16:00 to 21:00.

Event Background: Tandem solar cells feature a series of advantages, including high conversion efficiency, simplified manufacturing processes, the use of thin silicon wafers, low temperature coefficients, no light-induced degradation, potential for bifacial power generation, and more. With the application of technologies such as thin silicon wafers, low-indium targets, silver-coated copper, copper plating, and advanced printing techniques, tandem solar cells have made continuous progress in efficiency and cost reduction.
We sincerely invite you to participate in this event, showcase new products and technologies, and promote cooperation among industry, academia, and research!