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

Beomjun Park1,2,3, Sandeep Pandey1,2, Jangwon Byun1,3

  • 1Department of Chemistry, Advanced Materials Program, Konkuk University, Seoul 05029, Republic of Korea.

ACS Applied Materials & Interfaces
|March 18, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a new perovskite single crystal (PSC) X-ray detector using a carbon black-doped poly(3-hexylthiophene) interlayer. This enhancement improves stability and sensitivity for advanced X-ray detection and imaging applications.

Keywords:
carbon blackhigh-voltage toleranceperovskite X-ray detectorpoly(3-hexylthiophene)sensitivity

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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.