How does the presence of methyl iodide influence the kinetics of the halide exchange reaction in MAPbBr3 single crystals?

Label:chem

Topic
The kinetics of the halide exchange reaction in MAPbBr3 single crystals are influenced by the presence of methyl iodide, which acts as a source of iodide ions. Understanding the kinetics of this reaction is crucial for controlling the optoelectronic properties of perovskites and developing efficient and stable perovskite-based devices.

From: "Tuning emission and bandgap dynamics of MAPbBr₃ single crystals through halide exchange with methyl iodide", Chemical Physics Impact, Volume 10, June 2025, 100807
Answer
The presence of methyl iodide significantly influences the kinetics of the halide exchange reaction in MAPbBr3 single crystals. The reaction follows first-order kinetics, with a rate constant of 0.1049 min^-1 and a half-life of 6.6 minutes. This indicates that the reaction progresses relatively quickly, with significant changes in bandgap and emission properties occurring within 15 minutes. The linear relationship between the logarithm of concentration and reaction time, with a regression value of 0.958, confirms the first-order kinetics of the reaction. The presence of vacancies in the crystal lattice facilitates the diffusion of iodide ions from methyl iodide, enabling efficient halide exchange. This understanding of reaction kinetics is essential for optimizing the performance and stability of perovskite materials in optoelectronic applications.
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