Interfacial Potential Modulation for High-Voltage-Stable and Ultra-Sensitive Perovskite Single-Crystal X-ray...

Area of Science:

• Materials Science
• Detector Physics
• Radiological Imaging

Background:

• Perovskite single crystals (PSCs) show promise for X-ray detection.
• Improving detector stability and sensitivity at high bias voltages is crucial.
• Interfacial engineering is key to optimizing detector performance.

Purpose of the Study:

• To develop a highly sensitive and stable perovskite single crystal (PSC) X-ray detector.
• To investigate the effect of a carbon black-doped poly(3-hexylthiophene) (P3HT:CB) interlayer on detector performance.
• To explore interfacial potential modulation for enhanced X-ray detection.

Main Methods:

• Fabrication of a PSC X-ray detector with a P3HT:CB interlayer.
• Characterization of detector performance under various bias voltages.
• Analysis of interfacial properties, ion migration, and trap density.

Main Results:

• The P3HT:CB interlayer improved detector stability and sensitivity (>1.05 × 10^6 μC Gy_air^-1 cm^-2).
• Interfacial potential modulation reduced dark current and noise, increasing ion migration activation energy.
• An ultralow detection limit of 18.44 nGy s^-1 was achieved with stable operation up to 200 V.

Conclusions:

• Interfacial potential modulation using P3HT:CB is an effective strategy for enhancing PSC X-ray detectors.
• The developed detector demonstrates significant potential for X-ray detection and radiological imaging.
• This work highlights the importance of anode interface engineering for high-performance detectors.