Perovskite Dimensional Evolution Through Cations Engineering to Tailor the Detection Limit in Hard X-ray Response

Area of Science:

• Materials Science
• Solid-State Chemistry
• Detector Physics

Background:

• Halide perovskites offer high sensitivity and tunable optoelectronic properties for X-ray detection.
• Controlling perovskite dimensionality (0D, 2D, 3D) is key to optimizing performance.
• Lead-free perovskites are desirable for safety and environmental considerations.

Purpose of the Study:

• To investigate cation engineering for dimensional evolution in halide perovskites.
• To synthesize and characterize novel 2D lead-free perovskite single crystals for X-ray detection.
• To enhance X-ray detection sensitivity and reduce the detection limit.

Main Methods:

• Cation engineering to induce dimensional evolution from 0D/3D to 2D perovskite structures.
• Synthesis of centimeter-sized 2D lead-free perovskite single crystals (e.g., FPEA3SbI6).
• Incorporation of Sn2+ into vacancies to form continuous 2D frameworks and tune conductivity.

Main Results:

• Dimensional evolution from 0D/3D to 2D perovskites was achieved via cation engineering.
• A 2D lead-free perovskite single crystal (FPEA3SbI6) was successfully synthesized.
• Sn2+ doping in 2D FPEA3SbSn0.5I7 perovskites led to a record low detection limit coefficient of 0.65.
• Optimized charge collection in 2D structures minimized noise current and improved signal/noise ratio.

Conclusions:

• Dimensional evolution of halide perovskites is a viable strategy for advanced X-ray detection.
• 2D lead-free perovskites, like FPEA3SbSn0.5I7, demonstrate superior performance in low-dosage X-ray detection.
• The findings pave the way for highly sensitive and tunable X-ray detector technologies.