From August 20 to 22, the "21st China Photovoltaic Conference (CPVC-21)", hosted by the Photovoltaic Professional Committee, China Renewable Energy Society (China), was held in Ningbo, Zhejiang. The conference focused closely on the latest technological advancements and industrial development trends in the PV field, with an emphasis on hot topics for technical sharing and academic exchange. The team of Tongwei Co., Ltd.'s PV Technology Center was invited to attend and deliver keynote speeches, sharing the latest progress in Tongwei's technology research and development.

Dr. Li Jiawen, Perovskite Cell R&D Engineer from Tongwei's PV Technology Center, delivers a keynote speech

During the conference, Dr. Li Jiawen, Perovskite Cell R&D Engineer from Tongwei's PV Technology Center, delivered a keynote speech titled "Industrialization Technology Development of High-Performance Perovskite-Silicon Tandem Cells," introducing the latest progress of the Tongwei team in the research and development of perovskite/silicon tandem cells. Addressing the dual contradiction of humidity in the two-step process (insufficient reaction of the skeleton layer at low humidity, and decomposition defects induced by high humidity), the Tongwei team proposed a "stepwise annealing crystallization regulation strategy." This strategy overcame the core bottleneck of complete reaction of the perovskite on the textured substrate and uneven vertical distribution of ions, and the relevant results were recently published in the top international journal ACS Energy Letters.

Benefiting from this strategy, Tongwei has achieved a full reaction of the skeleton layer on commercial textured heterojunction silicon wafers and significantly improved the quality of perovskite thin films. The latest results show that the small-area tandem cell efficiency has reached 34.69%, and the 210 half-cell full-size cell efficiency exceeds 27.5%, laying a solid foundation for the industrialization process.

Fan Hualong, Manager of the PV Technology Center of Tongwei Co., Ltd., delivers a keynote speech

In his keynote speech, "Multi-Dimensional High-Precision Empirical Verification to Help Improve Product Performance," Fan Hualong, Manager of Tongwei's PV Technology Center, detailed Tongwei's empirical power station layout covering all climates and stages, ensuring data reliability through strict boundary control of "ten consistencies." Its high-precision data acquisition system, combined with long-term empirical data, accurately quantifies the impact of key parameters such as temperature and bifaciality on power generation performance, providing a scientific basis for product optimization.

Senior R&D Engineer Shen Xiaobao delivered a keynote speech on "Development and Application of a Multi-Dimensional Coupled Performance Simulation Platform for Photovoltaic Modules," sharing Tongwei's independently developed simulation platform. The simulation platform integrates optical, electrical, thermal, and fluid dynamics models, which can efficiently simulate the performance and risks of modules under complex environments, such as high-temperature hotspots and bracket matching, significantly improving the efficiency of new technology development.

Shen Xiaobao, Senior R&D Engineer of Tongwei Co., Ltd.'s PV Technology Center, delivers a keynote speech

These studies provide the industry with a closed-loop technical solution from empirical verification to simulation. With the continuous accumulation of empirical data and the continuous upgrading of simulation capabilities, Tongwei will continue to promote the optimization of photovoltaic product performance and the improvement of system reliability, providing the industry with more scientific and efficient solutions.

In the future, Tongwei will continue to use technological innovation as the engine, working with all parties in industry, academia, and research to jointly promote the iterative development of photovoltaic technology and the process of energy transition, injecting stronger "light" power for achieving the "dual carbon" goals and global sustainable development.