The team led by Academician Li Yongfang and Researcher Meng Lei at the Institute of Chemistry, Chinese Academy of Sciences, recently successfully fabricated high-performance perovskite–organic tandem solar cells, achieving a steady-state photoelectric conversion efficiency of 28.04% and marking a key step toward practical application. The result has been published in the international academic journal *Nature*.
Perovskite–organic tandem solar cells are constructed by stacking a wide-bandgap perovskite subcell and a narrow-bandgap organic subcell in series, allowing them to absorb sunlight across different wavelength bands and thus break the efficiency limit of single-junction solar cells. The efficiency improvement of such cells has long been hindered by issues such as large voltage loss in the wide-bandgap perovskite front subcell and insufficient stability. To address the efficiency challenge, the research team proposed a “full-stage regulation” strategy, designing and introducing photoconvertible additive molecules that promote uniform mixing of perovskite components, bind more firmly to the perovskite surface, and effectively suppress phase segregation under illumination.
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