Face-/Edge-Shared 3D Perovskitoid Single Crystals with Suppressed Ion Migration for Stable X-Ray Detector

Area of Science:

• Materials Science
• Solid-State Chemistry
• Detector Physics

Background:

• Three-dimensional metal halide perovskites show promise for X-ray detection.
• Ion migration in perovskites limits detector stability and performance.
• Developing stable perovskite-based X-ray detectors is crucial for advanced imaging.

Purpose of the Study:

• To synthesize novel 3D heterometallic glycinate hybrid perovskitoids.
• To investigate the suppression of ion migration in these new materials.
• To evaluate their performance as X-ray detectors, particularly for thin-film transistor (TFT) array applications.

Main Methods:

• Synthesis of face-/edge-shared 3D heterometallic glycinate hybrid perovskitoid Pb2CuGly2X4 single crystals (SCs) in water.
• Characterization of structural properties and ion migration activation energy (Ea).
• Fabrication and testing of Pb2CuGly2Cl4-based X-ray detectors and TFT array detectors.

Main Results:

• Achieved a high ion migration activation energy (Ea) of 1.06 eV due to Cu(Gly)2 pillars and inorganic skeleton.
• Demonstrated extremely low dark current drift (1.20 × 10^-9 nA mm^-1 s^-1 V^-1) under high electric field and X-ray irradiation.
• Obtained high sensitivity (9,250 μC Gy^-1 cm^-2) and X-ray imaging capability with a spatial resolution of 2.2 lp mm^-1 on a TFT array.

Conclusions:

• The synthesized Pb2CuGly2X4 perovskitoids effectively suppress ion migration, enhancing detector stability.
• Pb2CuGly2Cl4 exhibits excellent performance metrics for direct X-ray detection.
• The material's suitability for water dispersion and blade-coating enables fabrication of high-resolution X-ray imaging detectors on TFT arrays.