T1: TNC Cell Pilot Test Line
T2/T3: TBC Cell & Module Pilot Test Line
T4: Module R&D Center
T5: PV Testing Center
T6: HJT+THL GW-level Workshop
Perovskite Cell Lab
Cell Testing Center
Perovskite Cell Lab
Cell Testing Center
Tongwei Global Innovation R&D Center
R&D Center Planning
Tongwei Global Innovation R&D Center plans to cover an area of 608 mu, including an R&D workshop area of 108,000 m2 as well as the comprehensive administrative area, living area, testing center and relevant supporting facilities.
Apr 03, 2023
Nov 30, 2023
Apr 26, 2024
May-June 2024
Jun 06, 2024
Nov 18, 2024
1. On Apr 3, 2023, Chairman Liu Hanyuan and Chairman Liu Shuqi inspected the Shuangliu Base and gave important instructions on the construction of the R&D center.
2. On Nov 30, 2023, Tongwei launched the construction of its first global innovation R&D center.
3. On Apr 26, 2024, the first batch of process equipment of Tongwei Global Innovation R&D Center successfully entered the site.
4. From May to June 2024, T1-T4 workshops were put into R&D successively.
5. On Jun 6, 2024, the first HJT+THL cell rolled off the production line in the T6 workshop of Tongwei Global Innovation R&D Center, marking the official completion and commissioning of the center.
6. On Nov 18, 2024, Tongwei Global Innovation R&D Center made a grand debut at the 7th China International PV and Energy Storage Industry Conference (CIPESIC 2024).
Research directions include high-efficiency crystalline silicon cells and materials, high-efficiency and high-reliability modules, photovoltaic testing and analysis, new technologies, etc., with a particular focus on the development of core technologies and cutting-edge technologies in the fields of TNC, THC, TBC cells and modules, copper interconnection metallization, perovskite/silicon tandem solar cells, new photovoltaic modules, etc. Furthermore, the Global Innovation R&D Center is committed to the analysis and characterization of materials and devices, reliability testing and evaluation of module products, etc.
HJT Copper Interconnection and
Perovskite Cell Integrated Workshop
Perovskite Cell Integrated Workshop
An integrated HJT copper interconnection and perovskite cell workshop with the largest workshop area, the highest pilot production capacity, and the strongest upgradability, suitable for the R&D of new technologies in the next 5 to 10 years.
PV testing center
A PV testing center with the world’s largest standalone area, most advanced technologies and most inclusive testing capabilities of PV cell, module materials and products, covering cell testing lab, materials physics and chemistry lab, and module reliability lab, competent in standard testing, rigorous testing, failure analysis, accelerated development, analog computing, etc.
High-efficiency Cells and Modules
The main R&D base of Tongwei‘s PV technology center is Tongwei Global Innovation R&D Center. It’s located in Chengdu of Sichuan Province and has branches in cities including Hefei of Anhui Province. Currently, Tongwei has made important breakthroughs in mainstream technology fields such as TOPCon, HJT, BC, and perovskite/silicon tandem solar cells.
Advanced Technology
BC -- N-type TBC R&D efficiency reached 26.84% in 2025Q1
Perovskite/Silicon Tandem -- R&D efficiency reached 34.33% in May 2025
Technology Center of Yongxiang Co., Ltd.
Yongxiang Co., Ltd., a subsidiary of Tongwei Co., Ltd., has three provincial-level R&D platforms: Sichuan Provincial Polysilicon Engineering Technology Research Center, Sichuan Provincial High-Purity Crystalline Silicon Preparation Technology Engineering Lab, and Tongwei Semiconductor R&D Center.
Electronic grade polysilicon preparation technology
High-purity crystalline silicon manufacturing energy-saving technology and equipment development
High-purity crystalline silicon intelligent manufacturing technology
Polysilicon system steam cascade utilization technology
Reduction furnace one-start full-process automation technology
Low energy consumption and zero emission polysilicon green preparation technology and system integration technology
High-purity Crystalline Silicon
Yongxiang Co., Ltd., a subsidiary of Tongwei, has established a polysilicon engineering technology research center, an enterprise technology center, a high-purity crystalline silicon preparation engineering lab, and a postdoctoral innovative practice base. By the end of May 2024, Yongxiang had applied for 952 patents and had 644 valid patents.
Core Technologies
Cold Hydrogenation
Anti-disproportionation
High-efficiency Reduction
Tail Gas Recovery
High-boiling-point Cracking
320+ Patented Technical Achievements
Comprehensive Cascade Utilization of Thermal Energy
Automated Control of Electrical Devices
Closed Circulation of Chlorine and Hydrogen Elements
Large-scale Energy-saving Distillation
Continuously Iterated and Upgraded Processes and Technologies
1G
Thermal Hydrogenation Technology
2G
Hydrogen Tetrachloride Self-circulation Technology
3G
Small-scale Cold Hydrogenation Technology
4G
Large-scale Cold Hydrogenation Technology
5G
5G Yongxiang Method
6G
Reactive Distillation Technology
7G
7G Yongxiang Method
8G
8G Yongxiang Method