3D/1D Perovskite Heterojunction for High-Performance Direct X-ray Detector

Area of Science:

• Materials Science
• Semiconductor Physics
• Radiation Detection

Background:

• Metal halide perovskites offer excellent X-ray attenuation and carrier properties for radiation monitoring.
• Challenges like high dark current and ion migration in 3D perovskites limit their practical use.
• Next-generation semiconductor materials are needed for advanced X-ray detectors.

Purpose of the Study:

• To develop a stable and high-performance X-ray detector using perovskite materials.
• To address limitations of 3D perovskites, specifically dark current and ion migration.
• To investigate the efficacy of a 3D/1D perovskite heterojunction strategy.

Main Methods:

• Synthesis of a unique 3D/1D perovskite heterojunction with a crisscross-structured 1D crystal.
• Formation of a robust interface between 3D and 1D perovskite crystals.
• Fabrication and characterization of a direct X-ray detector based on the heterojunction.

Main Results:

• The 3D/1D heterojunction demonstrated high ion migration activation energy, reducing ion migration and dark current.
• The detector achieved high operational and storage stability.
• Exceptional detection sensitivity (1.03 × 10⁵ µC Gy_air ^-1 cm^-2) and low detection limit (4.9 nGy_air s^-1) were recorded.
• Superior imaging quality and spatial resolution were confirmed in X-ray imaging experiments.

Conclusions:

• The 3D/1D perovskite heterojunction is an effective strategy for overcoming stability and performance limitations in X-ray detectors.
• This novel heterostructure shows significant potential for high-performance, stable, and reliable radiation monitoring applications.
• The developed material advances the field of perovskite-based X-ray detection technology.