Abstract
In-situ study of the variation of the chemical composition of triple-cation mixed halide perovskites Cs0.05(MA0.17FA0.83)0.95Pb(I0.83Br0.17)3 under visible light illumination performed by Fast Scanning Nano Hard X-ray Fluorescence Imaging revealed the migration and irreversible phase separation of halide ions into micro-meter sized clusters.
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