N-Type Leadership | Song Dengyuan, CTO of Yidao New Energy: National Photovoltaic Demonstration Base TOPCon Power Generation Continues to Lead with 5.0 Technology Empowering New Heights for N-Type

On May 15, 2025, the “SEMI Advanced N-Solar Cell and Standards Forum,” organized by the Semiconductor Industry Association (SEMI) and hosted by Huasheng New Energy, was grandly held in Xuancheng, Anhui. Over 200 researchers, technical experts, and scholars from photovoltaic upstream and downstream enterprises, testing organizations, research institutions, and higher education institutions attended the conference. Experts at the meeting engaged in in-depth discussions on cutting-edge technologies and standards in the industry, including the efficiency potential of N-type technology, UVID reliability testing technology, battery edge passivation technology and applications, as well as testing standards for solar cells and modules. Dr. Song Dengyuan, Chairman of the SEMI China Standards Technical Committee and CTO of Yidao New Energy, attended the conference and chaired the TOPCon technology forum, delivering a keynote report titled “Innovations and Progress of Yidao New Energy TOPCon 5.0 Technology.”

TOPCon Continues to Lead N-Type Technology

During his presentation, Dr. Song emphasized that among the three N-type technology routes currently available, TOPCon offers the highest overall cost-performance ratio and the lowest production costs. Yidao New Energy has consistently focused on the TOPCon technology, achieving numerous breakthroughs and advancements, positioning itself as a leader in N-type technology. With the introduction of TOPCon 5.0, Yidao New Energy has once again placed itself at the forefront of N-type technology.

Market Projections for TOPCon Technology

According to the CPIA “China Photovoltaic Industry Development Technology Roadmap (2024-2025)”, TOPCon is projected to become the mainstream technology by 2025, with its market share expected to rise from 71.1% in 2024 to an estimated 81.4% in 2025. CPIA predicts that by 2030, the market share will stabilize around 60%, indicating a long lifecycle for TOPCon technology.

TOPCon 5.0 Elevates N-Type Technology to New Heights

Yidao New Energy’s recently launched TOPCon 5.0 technology has achieved significant breakthroughs in efficiency and reliability. The five core technologies, which include new structures, mechanisms, processes, materials, and principles, have increased battery efficiency to 27%, while the UVID120 degradation rate is below 0.8%, further enhancing reliability.

• New Structure: Forms micron-level “light traps” on the back of the battery, improving infrared light absorption efficiency by 0.3%-0.5%.
• New Mechanism: Creates nano-scale contact points through laser-induced processes, reducing contact resistance to below 0.5 mΩ·cm².
• New Process: Utilizes innovative paste and steel plate printing technology to enhance the utilization of incident photons, increasing the fill factor to over 85%.
• New Materials: Employs a unique organic/inorganic hybrid passivation material to reduce edge recombination losses and improve battery efficiency.
• New Principle: Applies coupling passivation principles through atomic layer deposition technology, enhancing the UV resistance of hydrogen-silicon bonds by an order of magnitude, with a degradation rate below 0.8% under UVID120 aging tests.

TOPCon Exhibits the Highest Comprehensive Power Generation

In May 2025, the National Photovoltaic and Energy Storage Demonstration Experiment Platform (Daqing Base) released the power generation data for various types of components for 2024. The report indicated that “the power generation trend for 2024 is consistent with previous years, with TOPCon components achieving the highest power generation. From 2022 to 2024, the average power generation of TOPCon was 2.02% higher than PERC and 1.43% higher than IBC components.”

Dr. Song believes that the core of photovoltaic technology application lies in its power generation capability. The National Daqing Base is the most authoritative photovoltaic technology demonstration base in China, capable of eliminating errors in power generation data caused by external environmental factors due to its scale, data collection precision, and the duration of the experiments, ensuring data accuracy and authority. The consistent leading power generation of TOPCon technology over the past two years demonstrates its excellent comprehensive power generation capabilities.

The essence of photovoltaics is clean energy, which will replace traditional fossil fuels. Therefore, reducing the levelized cost of electricity (LCOE) of photovoltaics is central to the iterative development of photovoltaic technology. Mainstream photovoltaic technologies must exhibit optimal power generation capacity and LCOE. The robust industrial ecosystem is crucial for the rapid development of TOPCon technology, where the establishment of a sound industrial chain will promote research and investment across the entire chain, accelerating efficiency improvements and cost reductions. Yidao New Energy remains committed to innovation leadership and has become a frontrunner in China’s N-type technology, making significant contributions to the industrialization and technological iteration of China’s photovoltaic N-type technology in the future.