Background
As global energy demand rises, there is increasing expectation for more efficient and sustainable solar power technologies. Perovskite/silicon tandem solar cells are at the forefront of meeting this need, with intense international competition, including Chinese companies like JinkoSolar achieving efficiencies in the 34% range. Beyond high efficiency, ensuring long-term stability is the most critical challenge for commercialization. This study represents a groundbreaking advancement in this field by significantly improving both efficiency and stability with a single additive.
Key Findings
This study reports that perovskite/silicon tandem solar cells have achieved an astonishing power conversion efficiency of 34.28% through the introduction of a multifunctional additive. This single-molecule strategy synergistically optimizes crystallization and band alignment, enabling high-quality wide-bandgap perovskite layers for efficient and stable monolithic tandem devices. Furthermore, unencapsulated devices demonstrated excellent stability, retaining over 93% of their initial efficiency after 2,000 hours of continuous 1-sun illumination at 65°C, marking a pivotal step towards the commercialization of next-generation solar cell technology.
Technical Details
Perovskite/silicon tandem solar cells are considered the most promising candidates to achieve efficiencies exceeding the theoretical limits of conventional single-junction solar cells. In this tandem structure, the perovskite top cell absorbs short-wavelength light, and the silicon bottom cell absorbs longer-wavelength light, maximizing the utilization of the solar spectrum. The key to this technology lies in the quality of the perovskite layer and the optimization of the interface between the two layers. The multifunctional additive developed by the research team plays two primary roles:
- Crystallization Control: When added to the perovskite precursor solution, it precisely controls the growth of perovskite crystals, promoting the formation of uniform, defect-free, wide-bandgap films.
- Band Alignment Optimization: The additive at the interface tunes the energy band alignment between the perovskite layer and the charge transport layer to an ideal state, maximizing charge carrier separation and extraction efficiency.
These synergistic effects led to a record-breaking certified efficiency of 34.28% on an active area of 1.001 cm². This value significantly surpasses the highest efficiencies of standalone silicon or perovskite solar cells. Moreover, the fact that unencapsulated devices maintained high efficiency for over 2,000 hours under harsh conditions provides strong evidence of the practical durability of this technology.
Strategic Significance and Outlook
The 34.28% efficiency achieved will significantly accelerate the commercialization of perovskite/silicon tandem solar cells. This technology holds the potential to maximize power generation per unit area and reduce overall system costs in large-scale solar farms, rooftop systems, and even new applications. Moving forward, the research team is expected to deepen its understanding of the multifunctional additive’s mechanisms, pursue large-area fabrication, simplify manufacturing processes, and conduct long-term reliability assessments under even more stringent conditions. This breakthrough is poised to shape the future of solar power and become a powerful driving force contributing to the global transition to clean energy.
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