Unite to Achieve Power of 760 W+

On Aug. 29, 2025, SoleFiori chaired the 14th roundtable meeting of the High-Efficiency HJT 760 W+ Club (the Club) successfully at the InterContinental Shanghai Hongqiao NECC. Twelve alliance member units attended the meeting: CNBM Jetion Solar, Golden Solar, Grand Sunergy Technology, Huasun, Jiangsu Soltrend, Leascend Photovoltaic, Mingyang, Quanwei, Shanghai Hency Solar Technology, SPIC New Energy, Tongwei, and Zhejiang Winhitech New Energy (listed alphabetically). SoleFiori also invited guests from Maxwell, the Chinese Academy of Sciences (CAS), and SOLARZOON.

Hou Hongtao and Wang Haijun, Vice Presidents of SoleFiori, co-hosted the meeting with the theme "Unite to Achieve Power of 760 W +." Discussions focused on cutting-edge industry topics like high-efficiency modules and HJT/perovskite tandem technology. Attendees explored paths for tech breakthroughs and industry collaboration mechanisms. The talks aimed to build consensus for high-quality development in the HJT sector.

Li Changhong, CEO of SoleFiori, delivered the opening address. He reviewed the Club's development since its founding and paid tribute to its founding members. Li stated that "760+" is not merely a number. It symbolizes the industry's shared vision for industrialization of the HJT/perovskite tandem technology. This vision aims to break efficiency barriers and achieve large-scale cost reductions. It also pursues a common dream of comprehensive HJT leadership. He called for greater industry confidence. "We must respond to technology with technology and answer sincerity with sincerity," Li said. “Only unity ensures steady progress. Only open cooperation unlocks the brilliant value of every sunlight.”

Technology Frontiers: Focusing on Core Breakthroughs to Unlock New Pathways for Cost Reduction and Efficiency Enhancement

Unite and Collaborate to Establish A Stable Supply Chain

Bai Sutong, Supply Chain Lead of SoleFiori, shared SoleFiori’s key procurement data for cells and modules. She reported market observations: Wafer manufacturers entered a price adjustment cycle after July. Glass prices are expected to rise in September. Bai addressed the high cost of equipment spare parts. She proposed alliance members deepen supply chain collaboration and achieve mutual resource support. The goal is to enhance the overall competitiveness of the industrial chain.

Focusing on Core Breakthroughs to Unlock New Paths for Efficiency Improvement

Shen Canjun, Module Tech Lead of Shanghai Hency Solar Technology, detailed progress in 0BB HJT high-efficiency module solutions. He highlighted 0BB's core advantages of cost reduction and efficiency gains. His team is collaborating with the industrial chain to tackle key issues, including welding process compatibility and film material durability. Shen urged the industry to accelerate standardization. He shared technical approaches for achieving over 23.8% module efficiency. These methods involve using multi-slicing and negative spacing with optimized insulation design.

In response to Shen's speech, representatives from several companies engaged in discussion:

Lian Weifei, R&D Director of Zhejiang Winhitech New Energy, stated their current 0BB technical direction has shifted to a solution: welding + glue printing. This move provides a referable optimization path for similar tech practices in the industry.

Guo Wanwu, Vice President of CNBM Jetion Solar, shared their positive progress in R&D of 0BB technology. He stated the technology has largely met expected targets in several key dimensions, demonstrating strong application potential. His team is now conducting in-depth optimization of certain processes for mass production needs. This effort aims to fully meet all reliability standards promptly. It will lay a solid foundation for the large-scale application of 0BB technology.

Breakthroughs and Call for Collaboration of Perovskite/HJT Tandem Technology

Zhou Jian, Chairman of Maxwell, presented the latest perovskite/HJT tandem cell solutions. He noted the difficulty of high industrialization for perovskite tandem technology. The first 100 MW pilot line represents a necessary sunk cost. Maxwell has established a full-process equipment platform, including inkjet printing, coating, and atomic layer deposition (ALD). The company achieved 34.02% efficiency for small-size perovskite/HJT tandem cells. Large-size tandem cells with 210 mm half-cells reached nearly 30% efficiency. Maxwell is advancing large-area process optimization. For breakthroughs in key technologies of HJT, he highlighted three directions. These are pure copper paste plus photon sintering technology, glass-based transfer printing, and third-gen back polishing with edge etching processes. Zhou called for the Club to establish a dedicated group for tandem. It would promote data sharing and joint R&D against uncoordinated efforts slowing industrialization.

In response to Zhou's proposal, several guests offered their suggestions.

Xing Guoqiang, CTO of Tongwei, expressed support for the group. Tongwei has already transitioned perovskite technology from the lab to pilot production. He noted persistent industry challenges, including frequent shifts in tech routes and excessive internal competition. These challenges led to the dispersion of R&D resources. Citing Sematech as an example, Xing urged the Club to lead industry resource integration. He proposed that Maxwell spearhead efforts to overcome challenges in core technologies like large-area uniform perovskite deposition. This collaboration would accelerate the industrialization of tandem technology.

Professor Liu Zhengxin from the CAS highlighted the importance of long-term reliability in copper paste technology for HJT/perovskite tandem industrialization. As silver in silver-coated copper paste continues to decrease, potential copper oxidation and diffusion issues may affect module durability. Liu recommended industry-wide collaborative innovation to optimize material processes and establish long-term evaluation standards. This effort would provide solid guarantees for the high-quality development of tandem technology.

Wang Wei, CTO of SPIC New Energy, identified copper metallization technology with copper electroplating for HJT cells as crucial for improving efficiency and reducing costs. He noted that while silver-coated copper remains the mainstream approach for reducing silver consumption, its reliance on traditional printing processes presents limitations. This method struggles to enhance efficiency and may compromise performance. Additionally, indium oxide costs remain high at approximately 0.03 to 0.04 yuan per watt. Wang stated that achieving balance requires designs with more and finer grid lines. SPIC New Energy has achieved mass production of front-side copper electroplating grid lines at the 10-micron level. This technology simultaneously addresses the indium oxide cost issue.

Zhang Wenbin, CTO and Executive Dean of the Research Institute at Grand Sunergy Technology, expressed support for tandem technology. He noted that early-stage reliability concerns are being progressively resolved. There is no need for excessive concern regarding its ability to achieve high performance and efficiency targets. The core challenge remains mass production adaptability. Existing technical methods like coating, ALD, and evaporation still face significant compatibility bottlenecks from a large-scale production perspective. Achieving industrialization of tandem technology requires disruptive technological innovation. This innovation must achieve coordinated breakthroughs across the entire chain from equipment to materials, escaping from delayed commercial deployment due to technical route uncertainty.

Roundtable Dialogue: Focusing on Industrial Upgrade and Collaborative Development

Policy Guides the Future: Strengthening Confidence in HJT/Perovskite Tandem Technology

Xu Xiaohua, Huasun Chairman, summarized key messages from two recent meetings of Ministry of Industry and Information Technology (MIIT). He outlined state measures addressing excessive internal competition, including stricter control over new production capacity, crackdowns on low-quality and predatory pricing, standardized bidding processes for state-owned enterprises, support for mergers and reorganizations, and promotion of tandem technology. Xu also indicated potential increases to minimum module price floors. Acknowledging the sector facing a challenging journey ahead, Xu emphasized two critical factors for success: unwavering confidence in state-backed HJT-perovskite tandem technology as the definitive future direction and robust execution capabilities demonstrated through continuous efficiency gains, cost reductions, and technological breakthroughs. He called for industry unity and resolve to navigate this prolonged transition period collectively.

Collaborative Standardization to Enhance Efficiency

Tang Doudou, Vice President of Leascend Photovoltaic, stressed the urgency of standardizing wafer sizes. She pointed out that the current silicon wafer procurement cycle is lengthy, and companies have differing requirements regarding stencil patterns and wafer chamfering. These obstacles significantly increase costs and complexity in the original equipment manufacturer of cells. Tang called on alliance members to strengthen industrial coordination. She proposed unifying wafer dimensions as a critical step to improve overall industry efficiency and competitiveness. This effort would solidify the foundation for reducing HJT costs and enabling large-scale application.

Tang Anmin, R&D Director of Leascend Photovoltaic, urged the industry to adopt a rational perspective on power output data. Faced with market demands for higher module performance, the company pursued practical technical upgrades. Without extensive equipment modifications at the cell production, Leascend enhanced power output through multi-slicing and high-density packaging at the module production. This approach strengthens HJT product competitiveness through improving efficiency.

Collaborative Efforts to Enhance Reliability and Build a New Quality Ecosystem

Professor Liu Zhengxin from CAS cited valuable data from the Daqing National PV and Energy Storage Demonstration Base. This data provides critical direction for the continuous optimization of HJT technology. He emphasized that the current phase is pivotal for further improving quality and gaining market trust. Liu highlighted that demonstration bases serve as essential platforms for industry tech iteration and quality validation. He urged companies to intensify R&D and optimization of key processes such as film and encapsulation. This effort fully demonstrates the true performance of HJT technology using high-standard products. He also proposed that the Club lead the establishment of more scientific and unified degradation testing standards. This initiative would promote an objective and fair product evaluation system. Liu encouraged companies to submit representative, cutting-edge products for empirical testing. Such collaboration aims to collectively build a market image of HJT technology as highly efficient and reliable.

Zong Jun, Vice Chairman of SPIC New Energy, delivered a speech regarding the reliability and market application of bifacial modules with 23.8%+ efficiency. He emphasized the strong alignment of HJT technology’s high bifaciality and low degradation with the requirements of future mainstream solar bases in northwestern sand-gobi-desert regions and high-altitude areas. To address the unique local conditions and accelerate technology adoption, he called for alliance members to collaborate on enhancing long-term product reliability under harsh conditions and improving market understanding. Zong proposed establishing a joint bidding mechanism and promoting unified standard certification and value assessment systems. This approach would consolidate industry strength to efficiently respond to large-scale project tenders.

Tian Jiehua, Deputy General Manager of Huasun Technology Center, shared the company's practices in degradation improvement. She stated Huasun limited module degradation to below 1% through optimizing the CVD and PVD processes and PID testing methodology.

Collaborative Efforts Against Involution to Build a Healthy Ecosystem

Liu Chang, SOLARZOOM founder, proposed anti-involution measures from an industry ecology perspective. He noted that industry-wide losses have triggered negative perceptions among investors and banks. Without changing the low-price competition model, tech progress will be severely constrained. Referencing the MIIT’s minimum price floor, Liu urged alliance members to establish unified pricing standards for HJT modules. He recommended imposing penalties for low-price competition and achieving profit recovery through price coordination. "A profitable industry is essential to attract capital investment and resolve current financial constraints." Liu stated.

Long Wei, Director of the Cell Development Department in the Tongwei PV Technology Center, stated the company has proactively adopted stricter TÜV Rheinland certification standards for its HJT modules. Tongwei is accelerating tech R&D, targeting to improve significant efficiency by 2025. This initiative aims to establish a clear power output advantage.

Yu Yi, Vice President of Huasun, emphasized the company's dual strategy focusing on both cost and market. Over the past six months, Huasun significantly reduced BOM costs from cell to module level through multiple optimizations, including adopting silver-coated copper paste with 10% silver content, metal screen printing with ultra-fine lines, and combining with 0BB technology. For market expansion, Huasun simultaneously implements both cost parity and high power output. The company focuses on mainstream products with 720W power, offering the best cost and adapting for markets like Brazil, where logistics costs are critical. Meanwhile, it advances R&D and production of high-power products with 730W+ power to meet diverse global customer needs.

Hu Jianbo, Vice President of Shanghai Hency Solar Technology, said the group's strategy remains focused on HJT. The company is maintaining a cautious short-term approach while increasing R&D investment in front-end processes. Its goal is to align HJT costs with TOPCon technology, laying a solid foundation for future tech upgrades.

Qi Feng, Sales Director of Golden Solar, called for an end to internal competition based on corporate experience. He urged alliance members to uphold cost bottom lines. "Some companies are dumping Class-A modules at rock-bottom prices," Qi stated. “This practice reduces HJT products from premium offerings to bargain-basement commodities, severely damaging industry ecology.” He explicitly confirmed Golden Solar’s commitment to work with members to maintain market order.

Wang Fang, Key Account Director of Quanwei, hoped that the club platform would help explore effective paths for cost reduction and market expansion. He stated that companies must pool their collective strength to transition from internal competition to mutual value creation.

Unite to Achieve Power of 760 W+

The meeting convened core players in the HJT sector, forging a strong consensus on key priorities such as advancing efficiency, optimizing process coordination, and enhancing the reliability of tandem cells. Moving forward, the Club will continue serving as a critical platform for integrating upstream and downstream resources. It will focus on joint R&D and standard establishment for HJT/perovskite tandem technology. The industry remains committed to innovation-driven development, replacing inefficient competition with collaboration. These efforts will provide ongoing momentum for China's PV sector to advance next-gen technology and accelerate global energy transition.