Tongwei Shares Latest Perovskite-Silicon Tandem Cell Achievements at 21st CSPV, Will Host Next CSPV

On November 27, the 21st China Solar-grade Silicon and Photovoltaic Power Generation Symposium (CSPV 2025) was held in Huainan, Anhui, co-hosted by Shanghai Jiao Tong University (Solar Energy Research Institute), Zhejiang University (National Key Laboratory of Silicon Materials), Sun Yat-sen University (Solar Energy Systems Research Institute), and the Shanghai Solar Energy Society. The conference focused on cutting-edge photovoltaic technologies and the latest applications. Fan Hualong, manager of the Photovoltaic Technology Center at Tongwei Co., Ltd., was invited to attend and participate in the "Next Organizing Committee Handover Ceremony," officially announcing that Tongwei will host the 22nd CSPV conference. This reflects the industry's recognition of Tongwei's technological innovation capabilities and leadership position in the industry. During the handover ceremony, Dr. Xing Guoqiang, Chief Technology Officer of Tongwei Co., Ltd., extended a warm invitation via video to industry colleagues to gather in Chengdu, Sichuan in 2026 to discuss cutting-edge technologies and outline new development chapters.

Dr. Xing Guoqiang, Chief Technology Officer of Tongwei Co., Ltd. Photovoltaics

Deliver a speech via video for the handover of hosting the next conference.

The manager of the Photovoltaic Technology Center at Tongwei Co., Ltd., Fan Hualong.

Shen Wenzhong, the Vice Chairman and Secretary-General of the CSPV Conference, took over the flag of the new term.

Dr. Wu Lin, a senior engineer at the Photovoltaic Technology Center of Tongwei Co., Ltd., was invited to attend and give a keynote speech, sharing the latest progress in the development of perovskite-silicon tandem solar cells. In his presentation titled "Development of Perovskite-Silicon Tandem Solar Cells for Industrialization," Dr. Wu pointed out that the development of tandem solar cells has now shifted from the laboratory efficiency enhancement stage to the trial production stage.

Senior Engineer at Tongwei Co., Ltd. Photovoltaic Technology Center

Dr. Wu Lin delivers a keynote speech.

Through step-by-step annealing crystallization regulation and ternary skeleton layer structure optimization, Tongwei has addressed the issues of conformality, homogenization, and defect control in perovskite film formation on velvet substrates, achieving a breakthrough in cell open-circuit voltage (Voc) to 1.99V. In terms of scaling up, the company successfully expanded the process from a 1cm² size to a 210 half-cell full-size battery, reaching an efficiency of 30.58%. Furthermore, the megawatt-level pilot line, which Tongwei plans to commission in the third quarter of 2025, is focusing on key technologies such as silver-free metallization, ultra-low temperature interconnection, and 0BB, aiming to promote the large-scale, commercial application of perovskite-silicon tandem cells.

Hosting the next CSPV conference signifies that Tongwei's leading position in the field of photovoltaic technology innovation has been widely recognized by the industry. In the future, Tongwei will continue to deepen its technological research and development, promote technological advancement in the photovoltaic industry, contribute more "Tongwei power" to the development of global clean energy, and assist in achieving the "dual carbon" goals.