High-Performance Surface Barrier X-ray Detector Based on Methylammonium Lead Tribromide Single Crystals

Area of Science:

• Materials Science
• Solid-State Physics
• Radiation Detection

Background:

• Hybrid methylammonium lead tribromide (MAPbBr₃) perovskites are promising for ionization radiation detection.
• Efficient charge collection in MAPbBr₃ detectors remains a significant challenge, limiting their performance.

Purpose of the Study:

• To develop a fast-response, high-sensitivity X-ray detector using MAPbBr₃ single crystals.
• To address charge collection limitations by employing a surface barrier Schottky diode.

Main Methods:

• Fabrication of a Schottky diode device using MAPbBr₃ single crystals.
• Characterization of the device's performance at room temperature, focusing on response time and sensitivity.
• Evaluation of the Schottky surface barrier's effectiveness in managing leakage current and improving charge collection efficiency.

Main Results:

• Achieved fast response and high sensitivity in X-ray detection using the MAPbBr₃ Schottky diode.
• The Schottky surface barrier effectively mitigated large leakage currents at high electrical fields.
• Demonstrated a 3-fold improvement in performance compared to traditional photoconductor-based X-ray detectors.

Conclusions:

• The developed MAPbBr₃ Schottky diode detector offers a viable solution for overcoming charge collection challenges in perovskite-based radiation sensors.
• This technology holds significant potential for applications in nuclear medicine, particularly in advancing X-ray imaging technology.