What are the kinetics of the halide exchange reaction in MAPbBr3 single crystals?

Label:chem

Topic
Understanding the kinetics of halide exchange reactions is crucial for controlling the optoelectronic properties of hybrid halide perovskites. The reaction dynamics can provide insights into the ionic dynamics and stability of perovskites, which are essential for 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 halide exchange reaction in MAPbBr3 single crystals follows first-order kinetics. The reaction rate constant was calculated as 0.1049 min^-1, and the half-life of the reaction was determined to be 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. This understanding of reaction kinetics is essential for optimizing the performance and stability of perovskite materials in optoelectronic applications.
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