A Dynamic Diffusion-Controlled Antisolvent Method for Preparing High-Quality Halide Perovskite Single Crystals toward...

Area of Science:

• Materials Science
• Crystallography
• Solid-State Physics

Background:

• Scalable synthesis of high-quality halide perovskite single crystals is crucial for advanced radiation detection.
• Current methods face challenges in producing high-quality single crystals.

Purpose of the Study:

• To develop a novel method for controlled crystallization of halide perovskites.
• To enable the synthesis of millimeter-scale single crystals with improved properties for radiation detection.

Main Methods:

• A dynamic diffusion-controlled antisolvent method was employed to modulate interfacial methanol diffusion.
• This approach controlled nucleation and facilitated crystal growth.

Main Results:

• Millimeter-scale cesium lead bromide (CsPbBr₃) single crystals with ultralow trap density and high orientation (texture coefficient ∼99.9%) were synthesized.
• X-ray detectors fabricated from these crystals demonstrated ultrasensitive response (1.09 × 10⁶ μC Gy^-1 cm^-2) and robust gamma-ray stability (>10⁴ Gy).
• The method proved broadly applicable to methylammonium lead bromide (MAPbBr₃) and formamidinium lead bromide (FAPbBr₃) systems.

Conclusions:

• The dynamic diffusion-controlled antisolvent method offers a universal strategy for perovskite single crystal growth.
• This work provides mechanistic insights into interface engineering for solvent-antisolvent systems.
• The findings open new avenues for perovskite-based optoelectronics and radiation detection technologies.