High-Sensitivity Perovskite γ-Ray Detectors Enhanced by Device Engineering Toward Energy Spectroscopy Imaging

Area of Science:

• Materials Science
• Nuclear Instrumentation
• Medical Physics

Background:

• Perovskite detectors for gamma-ray detection are emerging but face limitations in adaptive processing, theoretical frameworks, and applications.
• Existing gamma-ray detector technology requires advancements for improved resolution and broader utility.

Purpose of the Study:

• To enhance the performance of perovskite-based gamma-ray detectors through improved electrode design.
• To establish a systematic theoretical framework for gamma-ray detector performance assessment.
• To introduce novel applications for gamma-ray detectors, including spectral-enhanced imaging.

Main Methods:

• Optimized electrode configuration to reshape bias electric field and guide signal carriers, mitigating noise.
• Theoretical analysis, simulations, and experimental comparisons to validate performance improvements.
• Extension of X-ray sensitivity definition to quantitatively assess gamma-ray response.

Main Results:

• Demonstrated clear improvement in energy resolution from 7% to approximately 5%, with a highest observed resolution of 1.9%.
• Achieved a sensitivity of approximately 10^5 µC Gy_air^-1 cm^-2 for gamma-ray detection.
• Proposed a spectral-enhanced imaging strategy utilizing the spectral dimension for improved contrast and image quality.

Conclusions:

• The optimized electrode configuration significantly enhances the energy resolution of perovskite gamma-ray detectors.
• The extended sensitivity metric provides a quantitative measure for gamma-ray detector performance.
• The proposed spectral-enhanced imaging strategy broadens the application scope of these detectors in various fields.