A bulk Schottky junction for high-sensitivity portable radiation detectors.

Area of Science:

• Materials Science
• Solid-State Physics
• Detector Technology

Background:

• Traditional X-ray detectors require thick materials and high voltages for carrier extraction.
• Existing technologies face limitations in sensitivity, detection limits, and power consumption.

Purpose of the Study:

• To develop a highly sensitive and low-voltage X-ray detector.
• To explore the use of bulk Schottky junctions with interpenetrated macroporous-carbon electrodes and metal-halide perovskite networks for X-ray detection.
• To demonstrate the potential for portable X-ray imaging applications.

Main Methods:

• Fabrication of a bulk Schottky junction device utilizing interpenetrated macroporous-carbon electrodes and metal-halide perovskite networks.
• Characterization of X-ray detection performance, including sensitivity, detection limit, and spatial resolution.
• Evaluation of device stability and uniformity under X-ray exposure.
• Development of a dry battery-powered portable X-ray alarm prototype.

Main Results:

• Achieved a high sensitivity of 1.42×10^5 μC Gy_air^-1 cm^-2.
• Demonstrated a low detection limit of 48 nGy_air s^-1 at a low operating voltage of -1 V.
• Observed a high gain effect due to electrons in the perovskite phase.
• Exhibited decent stability under X-ray exposure, a spatial resolution up to 5.0 lp mm^-1, and remarkable uniformity in detector arrays.
• Successfully fabricated a portable X-ray alarm prototype.

Conclusions:

• The proposed bulk Schottky junction X-ray detector offers superior performance characteristics, including high sensitivity and low-voltage operation.
• The device's stability, resolution, and uniformity indicate significant potential for advanced X-ray imaging and portable detection systems.
• This technology paves the way for more accessible and efficient X-ray detection solutions.