Photo-induced macro/mesoscopic scale ion displacement in mixed-halide perovskites: ring structures and ionic plasma oscillations

HIGHLIGHTS

SUMMARY

    Spatially resolved PL or cathodoluminescence (CL) probe within the illuminated area revealed that the conversion was nonuniform, but the overall area of the "I-rich" regions increased with illumination time, and eventually appeared to reach a steady_state covering the entire illuminated area15,20,21. If the Br ions remained in the illuminated area, as implied, the complete quenching of the alloy state PL would suggest that the "I-rich" regions were uniformly embedded within the "Br-rich" matrix with an average separation distance shorter than the carrier diffusion length of the "Br-rich" matrix . . .

     

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