Perovskite-organic tandem cells reach 28.7% efficiency with new stabilizer
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Researchers developed a photo-transformable stabilizer that boosts perovskite-organic tandem solar cell efficiency to 28.7%. The stabilizer, activated by ultraviolet light, forms a protective layer that suppresses degradation under operational conditions.
The Stabilizer Mechanism
The photo-transformable stabilizer, reported in Nature on July 13, 2026, is a small molecule that undergoes a structural change upon UV exposure. This change creates a conformal coating on the perovskite layer, preventing ion migration and moisture ingress. The stabilizer does not require additional processing steps, integrating directly into the cell fabrication.
Efficiency and Stability Gains
Tandem cells with the stabilizer achieved a certified power conversion efficiency of 28.7%, up from 26.1% for untreated controls. The devices retained 95% of initial efficiency after 1,000 hours of continuous operation under full-spectrum illumination. This represents a significant improvement over previous perovskite-organic tandems, which typically degrade within hundreds of hours.
Commercialization Prospects
The stabilizer is compatible with scalable manufacturing techniques such as slot-die coating, according to the researchers. However, long-term outdoor testing and encapsulation optimization remain necessary. The team estimates that commercial modules could reach 25% efficiency within three to five years.
What's Next
The research team plans to test the stabilizer in larger-area modules and under real-world conditions. It remains unclear whether the stabilizer can be adapted for other perovskite architectures or if cost-effective production at scale is feasible.
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Perovskite-organic tandem cells reach 28.7% efficiency with new stabilizer
