Publication date: 22nd July 2026
Small changes in composition can strongly affect how perovskite materials behave under light. Mixed halide lead perovskites display light-induced halide migration, leading to iodide clustering and redshifted emission, often called photosegregation, that is reversible in the dark. This effect is usually explained by the high diffusivity of halide ions at room temperature. We have recently shown that these light-induced spectral changes are even more pronounced and highly dynamic in very bromide rich samples doped with a small amount of iodide.
In this work, we ask whether a similar effect can also occur in the less mobile part of the perovskite: the metal cations. We study mixed lead-tin perovskites doped with low percentages of Sn. We find that these materials also show highly dynamic photoluminescence emission spectra, suggesting that Sn-rich and Pb-rich regions can form under illumination. Our results demonstrate that light-driven restructuring in perovskites is not limited to halides, but can also involve the metal ions. This suggests that light could be used as a tool to actively reshape materials and control their properties. This could enable new ways to “write” functional structures into materials using light, instead of fabricating them beforehand.
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