Improved Crystallization Quality of FAPbBr₃ Single Crystals by a Seeded Solution Method

Area of Science:

• Materials Science
• Crystallography
• Optoelectronics

Background:

• Solution-grown hybrid perovskite, FAPbBr3, shows promise for optoelectronic devices due to its properties and low cost.
• Challenges in FAPbBr3 bulk crystal growth include uncontrollable morphology, irregular shapes, and limited sizes, stemming from dense nucleation.

Purpose of the Study:

• To investigate the impact of growth conditions and seed crystal behavior on FAPbBr3 crystallization quality and yield.
• To develop an optimized method for producing high-quality, large-scale FAPbBr3 single crystals.

Main Methods:

• Optimized spontaneous nucleation by controlling precursor concentration and heating rate.
• Introduced seeded crystal growth to address morphology and yield issues.
• Proposed an optimized seeded solution method with a heating rate of 0.1 °C/h.

Main Results:

• Achieved centimeter-scale FAPbBr3 single crystals with high crystalline quality (narrow FWHM rocking curves).
• Obtained a high yield of approximately 100% for single crystals.
• Fabricated a detector demonstrating a bulk resistivity of 3.42 × 10^9 Ω·cm, an I_ON/I_OFF ratio > 10^4, and energy resolution of ~21.4% for alpha particles.

Conclusions:

• The modified seeded solution method effectively produces high-quality and high-yield perovskite single crystals.
• This method holds significant potential for advancing perovskite-based optoelectronic and radiation detection applications.