High energy resolution CsPbBr₃ alpha particle detector with a full-customized readout application specific integrated...

Area of Science:

• Materials Science
• Nuclear Instrumentation
• Solid-State Physics

Background:

• Alpha particles require monitoring for applications in radioactive diagnostics and nuclear activity indication.
• Current perovskite detectors face limitations in energy resolution, hindering spectroscopy and imaging.
• The CsPbBr3 perovskite material shows promise but requires optimization for detector applications.

Purpose of the Study:

• To improve the energy resolution and stability of CsPbBr3 perovskite detectors for alpha particle detection.
• To investigate methods for reducing dark current and enhancing high-temperature performance.
• To evaluate detector performance with both commercial and custom readout electronics.

Main Methods:

• Solution-growth of CsPbBr3 crystals and thinning to reduce surface phases.
• Fabrication of detectors utilizing Schottky electrodes for improved performance.
• Characterization of dark current, energy resolution, and high-temperature stability.
• Testing with commercial electronics and a custom application-specific integrated circuit (ASIC).

Main Results:

• Thinning the CsPbBr3 crystal reduced dark current to 34.6 nA·cm⁻² at 200 V.
• Schottky electrodes further decreased dark current and enhanced high-temperature stability.
• An energy resolution of 6.9% was achieved with commercial electronics.
• A 1.1% energy resolution was obtained using a custom ASIC, minimizing parasitic capacitance and electronic noise.

Conclusions:

• Optimized CsPbBr3 perovskite detectors demonstrate significantly improved energy resolution and stability.
• The developed detector technology is suitable for alpha particle monitoring in diagnostics and nuclear applications.
• Custom readout electronics are crucial for achieving the full potential of CsPbBr3 detectors.