Cesium-Based Molecular Perovskites With Superior Stability for High-Performance X-Ray Detection

Area of Science:

• Materials Science
• Solid-state Chemistry
• Radiation Detection

Background:

• Metal-free molecular perovskites are promising for X-ray detection due to tunable properties and low toxicity.
• Limited X-ray absorption and environmental instability hinder their practical use.

Purpose of the Study:

• To develop cesium-based molecular perovskites (MDABCO-CsX3) for improved X-ray detection.
• To investigate the impact of halide composition (Cl, Br, I) on material properties and device performance.

Main Methods:

• Synthesis of MDABCO-CsX3 perovskites with varying halides.
• Systematic investigation of physical properties and X-ray detection performance.
• Analysis of environmental and thermal stability.

Main Results:

• MDABCO-CsBr3 demonstrated superior environmental stability due to optimal Br- ionic radius and chemical stability.
• Higher tolerance factor in MDABCO-CsBr3 promoted a stable cubic structure and reduced ion migration.
• MDABCO-CsBr3 detectors achieved high sensitivity (4124 µC Gy-1 cm-2), low detection limit (0.45 µGy s-1), and excellent thermal stability up to 130 °C.

Conclusions:

• MDABCO-CsBr3 is a highly stable and efficient material for X-ray detection.
• Cesium incorporation and halide modulation are effective strategies to enhance molecular perovskite performance.
• These findings pave the way for advanced molecular perovskite applications in radiation detection.