Enabling Sensitive and Stable X-ray Detection in a 2D Trilayered Hybrid Perovskite with Strong F-π Interactions

Area of Science:

• Materials Science
• Solid-State Physics
• Detector Technology

Background:

• Organic-inorganic hybrid perovskites offer potential for X-ray detection due to combined material properties.
• Ion migration in perovskites under voltage hinders simultaneous high sensitivity and operational stability.
• Existing 2D perovskites often face limitations in carrier transport and stability.

Purpose of the Study:

• To engineer a 2D trilayered hybrid perovskite overcoming ion migration challenges for enhanced X-ray detection.
• To achieve high sensitivity and operational stability in a single perovskite material for X-ray detectors.
• To explore the potential of multilayered 2D perovskites with strong interlayer interactions for sensitive and stable X-ray detection.

Main Methods:

• Synthesized a novel 2D trilayered hybrid perovskite, (FBZA)2(MA)2Pb3Br10, utilizing F-substituted aromatic spacers.
• Investigated carrier transport properties, achieving a high mobility-lifetime product of 1.3 × 10^-3 cm^2 V^-1.
• Evaluated X-ray detection performance, including sensitivity, limit of detection (LOD), and dark current drift under bias.

Main Results:

• The synthesized perovskite exhibited efficient carrier transport due to thick inorganic slabs.
• Achieved a high sensitivity of 2818.2 μC Gy^-1 cm^-2 and a low LOD of 43.7 nGy s^-1.
• Demonstrated low dark current drift (1.61 × 10^-7 nA cm^-1 s^-1 V^-1) and stable response under prolonged high-dose-rate X-ray irradiation at a large working voltage.

Conclusions:

• The developed multilayered 2D perovskite successfully integrates high sensitivity and operational stability for X-ray detection.
• Strong interlayer interactions in the designed perovskite contribute to its superior performance.
• This work provides insights for designing and constructing high-performance perovskite-based X-ray detectors.