Huasun Energy has recently achieved two groundbreaking milestones in the field of crystalline silicon heterojunction (HJT) and perovskite tandem solar cells, showcasing its innovation and leadership in commercializing this advanced technology. At the laboratory level, the team introduced a dual passivation strategy combining physical field effects and chemical bonds, significantly reducing interfacial non-radiative recombination losses. This innovation led to a remarkable efficiency of 34.02% in small-size (1 cm²) HJT-perovskite tandem solar cells, positioning Huasun as a global leader in this domain. Additionally, by incorporating new perovskite crystallization additives, high-mobility carrier transport layer materials, and optimizing grain orientation, energy level alignment, and interface stability, the team laid a solid foundation for further efficiency improvements.
On the industrial front, Huasun’s self-developed production line achieved an efficiency of 29.01% in large-size tandem solar cells (210 HP), nearly 4% higher than single-junction crystalline silicon solar cells. This breakthrough was made possible through Huasun’s proprietary large-texture thin-film deposition technology, which ensures uniform coating on complex surfaces and addresses key challenges in scaling perovskite materials. The introduction of organic stabilizers improved deposition uniformity and environmental stability, while new interface transport materials enhanced reliability and process compatibility. These advancements bring tandem cells significantly closer to mass production, marking a major step forward in the industrialization of this technology.
Tandem solar cells are widely recognized as the key to surpassing the efficiency limits of crystalline silicon. Huasun’s dual breakthroughs 34.02% efficiency in small-size cells and 29.01% in large-size production cells—not only validate the theoretical feasibility and practical scalability of tandem technology but also highlight its strategic importance. Once tandem efficiency exceeds 30%, solar power costs could drop below one US cent per watt, paving the way for cost-competitive green hydrogen and energy storage solutions. This achievement underscores the immense potential of HJT-perovskite tandem solar cells beyond single-junction counterparts, offering a scalable model for industrial production and opening a more efficient and cost-effective pathway for the global energy transition. It also bolsters industry confidence in producing high-efficiency, low-cost tandem cells at scale, accelerating advancements in heterojunction technology and its adoption across the photovoltaic sector.
Source: Huasun
