ArticleScience advances2026
In situ TEM unveils the role of residual local strain on light-induced phase segregation in halide perovskites.
Article in Science advances, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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Who cites it
1 citing paper in PubMed.
- Compositional Homogenization and Dielectric Modulation of Pb/Sr Mixed Perovskites for Efficient and Bright Deep-Blue Light-Emitting Diodes.Advanced materials (Deerfield Beach, Fla.) · 2026Article
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Authors and funding
5 authors.
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Abstract
Deciphering the mechanisms governing photoinduced phase segregation in mixed halide perovskites is essential to unlock their full potential in stable, high-performance optoelectronic applications. We uncover the mechanism by which residual local strain acts as a key driving force of light-induced phase segregation. By combining in situ transmission electron microscopy with photoluminescence spectroscopy, we observe structural evolution and photocarrier behavior during phase segregation and after re-mixing. Although halide segregation is compositionally reversible, the perovskite lattice retains residual local strain, a "memory" of previously segregated halide domains, which evolves spatiotemporally with each phase segregation cycle. Residual local strain subsequently serves as a driver for successive phase segregation by trapping photocarriers and acts as the nucleation sites for iodide-rich domains. Our findings identify local strain as an intrinsic, evolving driving force of phase segregation, which offers a paradigm for improving the long-term stability of halide perovskites through strain management and compositional engineering.
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