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Results for “segregation”
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Elevated temperature microstructural stability in cast AlCuMnZr alloys through solute segregation
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Grain boundary and twin boundary solute segregations in nanocrystalline Al-Mg alloy
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Grain boundary segregation spectra from a generalized machine-learning potential
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How Chloride Suppresses Photoinduced Phase Segregation in Mixed Halide Perovskites
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Medial Packing, Frustration, and Competing Network Phases in Strongly Segregated Block Copolymers
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Oxide Decomposition and Sn Surface Segregation on Core/Shell Ge/GeSn Nanowires
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Structural Dynamics of Metal Halide Perovskites during Photoinduced Halide Segregation
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Heterogeneous Charged Complexes of Random Copolymers for the Segregation of Organic Molecules
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Local A-Site Phase Segregation Leads to Cs-Rich Regions Showing Accelerated Photodegradation in Mixed-Cation Perovskite Semiconductor Films
We use hyperspectral photoluminescence microscopy to study compositional heterogeneity and its influence on the stability of mixed-cation (formamindinium (FA) and cesium) FA 1-x Cs x Pb(I 0.9 Br 0.1 ) 3 lead halide perovskites with different Cs contents. We observe substantial microscale heterogeneity in the photoluminescence. By correlating photoluminescence maps with time-of-flight secondary ion mass spectrometry (ToF-SIMS) imaging, we show that the redder-photoluminescence regions of the perovskite film are associated with Cs-rich compositions. X-ray diffraction measurement and confocal Raman spectroscopy provide evidence for the presence of d-phase CsPbI x Br 3-x in these regions. Photo-aging tests show that these Cs-rich clusters undergo faster photoluminescence decay than the rest of the film. These observations highlight the importance of local heterogeneities and their influence on the stability of halide perovskite semiconductors being studied for optoelectronics.