German researchers have developed a fully solvent-free perovskite-silicon tandem solar cell using sequential evaporation, achieving a power conversion efficiency of 27.1%. The scalable approach also demonstrated significant stability, retaining 97.06% of its initial efficiency after 6,800 hours of dark storage under nitrogen.
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https://www.pv-magazine.com/2026/08/28/solvent-free-perovskite-silicon-tandem-solar-cell-achieves-27-3-efficiency/
