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Uniform film formation helps tandem solar cells work better for longer

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When making mixed-halide perovskite films for use in solar cells, bromide-rich domains crystallize faster than iodide-rich ones do, leading to defects. Adding a molecule tuned to bind selectively to bromide-bound lead synchronizes the crystallization rates, yielding uniform films, better operating stability and a more-efficient perovskite–organic tandem.

This is a summary of: Shi, P. et al. Phase-homogeneous mixed-halide perovskites for stable tandem photovoltaics. Nature 657, 121–126 (2026).

doi: https://doi.org/10.1038/d41586-026-02709-9

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  • Read the paper: Phase-homogeneous mixed-halide perovskites for stable tandem photovoltaics

  • High-performance perovskite–organic tandem solar cells

  • Solar cells that combine multiple perovskite layers surpass 30% efficiency

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