From December 1st to 3rd, 2025, the 8th International Silicon Heterojunction Solar Cell Workshop and the 1st International Perovskite-Silicon Tandem Solar Cell Workshop were held in Daejeon, South Korea. Jointly organized by SNEC, the Korea Institute of Energy Research (KIER), and Forschungszentrum Jülich from Germany, the event gathered top academic experts and industry leaders from the global HJT and tandem technology fields to explore these two future-shaping photovoltaic technologies.
Vick Peng, Deputy Director of Cell R&D at Maxwell, was invited to deliver a keynote speech titled “Advancing SHJ Towards 27% Efficiency – High-Performance Foundation for Future Tandem Technologies.” He shared Maxwell’s latest R&D progress and technological roadmap in the HJT field, outlining key technical directions for the industry to achieve the milestone of 27% mass-production cell efficiency.
HJT Mass-Production Technology Achieves 26.8% Efficiency Breakthrough
In November this year, certified by Institute for Solar Energy Research Hamelin (ISFH), the N-type crystalline silicon heterojunction cells (210H full-area 220.6 cm²) developed by Maxwell using self-developed mass-producible equipment and processes achieved a conversion efficiency of 26.8%. The preparation of this batch of cells was based on industrial-grade silicon wafers and screen-printed electrodes, incorporating multiple innovative technologies such as microcrystalline structure and material optimization, and carrier transport-passivation balance. The related equipment, materials, and processes are fully viable for large-scale mass production.
At the conference, Peng provided an in-depth analysis of the key technologies behind this efficiency breakthrough, covering material innovation, equipment structure optimization, and process upgrades.
Next-Generation HJT Technology Layout Targeting 27% Efficiency
Building upon the aforementioned validated and effective efficiency enhancement technologies, Peng further introduced Maxwell’s exploration and discoveries regarding next-generation HJT cells. He pointed out that achieving the ultimate balance between passivation and carrier transport is the core for further efficiency gains and the key to laying a high-performance foundation for perovskite/silicon tandem technology.
Peng emphasized that, integrating existing technologies and R&D reserves, and with the collaborative efforts of the entire industry chain, achieving 27% mass-production efficiency for HJT cells is a practical and feasible goal.
HJT’s Cost and Sustainability Advantages Stand Out
Beyond leading efficiency, the low-cost potential of HJT technology is accelerating. As silver paste prices continue to rise, the advantage of low silver consumption in HJT cells is becoming increasingly prominent, further enhancing their cost competitiveness. Combined with characteristics like low silicon material consumption, shorter process steps, and low carbon emissions, HJT is becoming one of the most competitive and sustainable high-efficiency photovoltaic technologies.
Moving forward, leveraging its deep expertise and innovative capabilities in HJT equipment and cell technology, Maxwell will continue to explore paths for cost reduction and efficiency improvement, promote the efficient transformation of R&D achievements into industrialization, and support the industry’s optimization, upgrade, and steady development. The company will also accelerate the industrialization of tandem cells with its leading perovskite/SHJ tandem cell full-line solution, contributing more Maxwell expertise to the development of global clean energy.
◼ About Maxwell
Suzhou Maxwell Technologies Co. Ltd. (‘Maxwell’ or ‘Maxwell Technologies’) is a high-end equipment manufacturer in the pan-semiconductor industry, possessing independent R&D capabilities in core technologies such as vacuum, laser, precision engineering, software, and automation. In the solar PV industry, Maxwell specializes in advanced production solutions including full-automatic solar cell metallization lines, HJT cell manufacturing equipment and perovskite/HJT tandem cell manufacturing full-line solution, etc.
Founded in 2010, Maxwell has over 5000 employees and customers include the world’s leading solar manufacturers, including Tongwei Solar, Trina Solar, Longi, JA Solar, Jinko, Canadian Solar, etc.
◼ Contact of Maxwell
Sky Sheng
PV Sales Director
+86 0512-6166 8888
+86 150 2100 2367
shengchenxin@maxwell-gp.com