Portable Dosimeter With Ultralow Detection Limit Enabled by Large Size Solution Grown Inorganic Perovskite Single...

Area of Science:

• Materials Science
• Solid-State Physics
• Detector Technology

Background:

• Inorganic perovskite CsPbCl3 single crystals (SCs) are promising for X-ray detection but limited by small sizes (<1 mm) due to low raw material solubility in solution methods.
• This size constraint hinders their practical application in advanced X-ray detection systems.

Purpose of the Study:

• To overcome the size limitation of CsPbCl3 SCs for improved X-ray detection.
• To develop a cost-effective, scalable solution process for high-quality, large-sized CsPbCl3 SCs.

Main Methods:

• Enhanced raw material solubility by 28 times and improved crystallization matching.
• Employed a low-temperature solution process to grow CsPbCl3 SCs up to 13 mm.
• Fabricated X-ray detectors using the grown SCs.

Main Results:

• Achieved large, high-quality CsPbCl3 SCs with low trap density (~10^8 cm^-3), high resistivity (2.35 ×10^9 Ω cm), and excellent µτ product (1.02 ×10^-3 cm^2 V^-1).
• Demonstrated X-ray detectors with record sensitivity (2.19 ×10^5 µC Gy^-1 cm^-2), fast response (307 µs), low noise, and stable output.
• Developed a prototype portable dosimeter detecting radiation as low as 0.07 nSv s^-1 and showcased high-definition X-ray imaging.

Conclusions:

• The developed strategy enables low-cost manufacturing of high-performance X-ray detection systems using large CsPbCl3 SCs.
• This advancement significantly broadens the potential of inorganic perovskites in radiation detection and imaging applications.