Uniform film formation helps tandem solar cells work better for longer

09 September 2026

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

ReferencesBrinkmann, K. O. et al. Nature Rev. Mater. 9, 202–217 (2024).Article