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High Resolution Image Download MS PowerPoint Slide Understanding and controlling photoinduced phase segregation (PIPS) is essential for improving the performance and stability of mixed-halide perovskite optoelectronic devices. In this work, we investigated the composition-dependent kinetics of PIPS in all-inorganic mixed-halide perovskite thin films. By tuning the halide ratio in CsPbI X Br 3– X, we demonstrate that the PIPS rate constant can be effectively manipulated, as higher iodide content leads to reduced crystallinity and increased defect density, which accelerates the PIPS process. Furthermore, time-resolved photoluminescence measurements reveal that the excited-state dynamics during PIPS differ significantly between iodide-rich and bromide-rich systems, underscoring the critical role of halide composition not only in governing PIPS kinetics but also in defining carrier relaxation pathways. These findings highlight the importance of compositional control over both PIPS kinetics and excited-state dynamics, providing new insights into the rational design of stable, compositionally tunable perovskite-based devices.
Okada et al. (Mon,) studied this question.