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Vaporization trick enables ‘tandem’ solar cells to be made at lower temperatures

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A clever approach for evaporating a compound used to make perovskite semiconductors tackles a vexing challenge in scaling up next-generation solar cells.

By

  1. Ulrich W. Paetzold

    1. Ulrich W. Paetzold is at the Institute of Microstructure Technology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany, and at the Light Technology Institute, Karlsruhe Institute of Technology, Karlsruhe, Germany.

  2. Paul Fassl

    1. Paul Fassl is at the Institute of Microstructure Technology, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany, and at the Light Technology Institute, Karlsruhe Institute of Technology, Karlsruhe, Germany.

Market-leading solar cells use crystalline silicon to convert sunlight into electricity, but have essentially reached the limit of the percentage of incoming light that they can harness. Solar cells that use materials called perovskites in tandem with silicon can exceed the conversion efficiency of silicon-only devices and are rapidly approaching commercialization. Yet it remains uncertain which manufacturing process will enable economically viable production of such solar cells on an industrial scale1. Writing in Nature, Luo et al.2 report a key advance that suppresses the degradation of a compound that is used to make thin films of perovskites through a method called thermal evaporation. This enables the fabrication of high-performance perovskite–silicon tandem solar cells at much lower temperatures than have been needed previously, and at the sizes required for commercial production.

doi: https://doi.org/10.1038/d41586-026-02469-6

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Competing Interests

The authors declare no competing interests.

  • Read the paper: Thermally evaporated perovskite/silicon tandems via formamidinium eutectic

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