Researchers at the Chinese Academy of Sciences (CAS) claim to have achieved a power conversion efficiency of 28.04% for a tandem solar cell based on a wide-bandgap perovskite bottom cell and a narrow-bandgap organic top cell.
In a press release, the researchers said the result was confirmed by an independent third party but did not identify the organization or specify what aspects of the device performance were verified. They also claimed the result represents a world record for this cell configuration.
The device also demonstrated excellent stability, retaining 90% of their initial efficiency after 625 hours of continuous operation under illumination.
The novelty of their approach consisted of using a a photo-transformable molecule known as 4-[3-(trifluoromethyl)-3H-diazirin-3-yl]benzylamine (TDB) to improve film homegeneity in the perovskite film used for the top cell.
During film formation, TDB can regulate molecular organization, crystallization dynamics, and interfacial interactions, leading to improved film uniformity, reduced defect density, and optimized charge-transport pathways. Such regulation can suppress the formation of detrimental defects and mitigate ion migration, thereby enhancing carrier extraction, operational stability, and resistance to light-induced degradation.
Furthermore, the ability of TDB to remain active under illumination provides continuous regulation during device operation, addressing key challenges associated with morphological instability and performance decay.
Under standard illumination conditions, the best-performing perovskite device delivered a power conversion efficiency of 20.01%, an open-circuit voltage of 1.42 V, and a fill factor of 85.13%. Incorporated into a tandem solar cell, it achieved a peak efficiency of 28.80%, but the reported value was accompanied by instability issues.
The solar cell was described in “Perovskite–organic tandem solar cells with a photo-transformable stabilizer,” published in nature.
In December, researchers from the University of Potsdam in Germany and the Chinese Academy of Sciences said they achieved an efficiency of 25.7% for a tandem solar cell based on the same configuration.
Later in June 2025, the Solar Energy Research Institute of Singapore (SERIS) claimed a 26.4% effiency for a perovskite-organic tandem solar cell based on a new type of organic absorber in the bottom cell, which reportedly “significantly” increased near-infrared (NIR) photon harvesting thanks to an asymmetric non-fullerene acceptor (NFA) known as P2EH-1V.
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