What is the role of halide exchange in tuning the optoelectronic properties of MAPbBr3 single crystals?

Label:chem

Topic
Hybrid halide perovskites, such as MAPbBr3, are materials with unique chemical and physical properties that make them suitable for various optoelectronic applications. The halide exchange reaction involves substituting halide ions within the perovskite structure, which can alter the material's composition, bandgap, and emission wavelength. This process is crucial for tailoring the optoelectronic properties of perovskites for applications like solar cells, light-emitting diodes (LEDs), photodetectors, and lasers.

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
Halide exchange plays a critical role in tuning the optoelectronic properties of MAPbBr3 single crystals by allowing precise control over the material's composition and bandgap. In this study, the halide exchange reaction was performed by exposing MAPbBr3 crystals to methyl ammonium iodide (MAI) in hexadecene solvent. This led to a gradual change in emission color from green to red, corresponding to a redshift in emission peaks from 540 nm (2.30 eV) to 730 nm (1.7 eV). The bandgap of the material also shifted progressively from 2.26 eV to 1.7 eV as iodide ions replaced bromide ions. This process enables the fine-tuning of perovskite bandgaps, which is essential for optimizing the performance and stability of perovskite-based devices.
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