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Updated: Jun 23, 2026

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E-Spray-Deposited CsPbBr3/Cs2AgBiBr6 Type-II Heterojunction Enabling High-Sensitivity Self-Powered X-ray Detection.

Haomiao Li1, Zhihang Zhang1, Hanxiao Peng1

  • 1Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Laboratory of Information Photonic Technique, School of Electronic Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

ACS Applied Materials & Interfaces
|June 22, 2026
PubMed
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This summary is machine-generated.

Researchers developed a thick-film perovskite Type-II heterojunction for self-powered X-ray detection using electrostatic spray deposition. This method enables high sensitivity and low power consumption for advanced X-ray imaging applications.

Area of Science:

  • Materials Science
  • Solid-State Physics
  • Optoelectronics

Background:

  • Perovskite Type-II heterojunctions show potential for self-powered X-ray detection due to built-in electric fields.
  • Fabricating thick heterojunctions with sharp interfaces via solution processing is challenging.

Purpose of the Study:

  • To develop a scalable method for creating thick CsPbBr3/Cs2AgBiBr6 Type-II heterojunctions with sharp interfaces.
  • To demonstrate self-powered X-ray detection capabilities of the fabricated heterojunctions.

Main Methods:

  • Electrostatic spray (E-spray) deposition with a solvent-compatible layer sequence (DMSO-based CsPbBr3 followed by DMF-based Cs2AgBiBr6).
  • Cross-sectional SEM and ToF-SIMS for interface characterization.
Keywords:
CsPbBr3/Cs2AgBiBr6 heterojunctiondirect X-ray detectionelectrostatic sprayself-powered X-ray detectorthick-film perovskite detectortype-II band alignment

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  • UPS, time-resolved photophysical characterization, and electrical/X-ray response measurements.

    • Main Results:

    • Achieved a sharp interface with minimized intermixing in the thick-film CsPbBr3/Cs2AgBiBr6 heterojunction.
    • Demonstrated heterojunction-assisted carrier separation and collection.
    • Exhibited self-powered X-ray detection with high sensitivity (226.82 μC Gyair-1 cm-2 at 0 V), low detection limit (0.028 μGyair s-1), and operational stability.

    Conclusions:

    • E-spray deposition offers a scalable strategy for fabricating high-quality perovskite Type-II heterojunctions.
    • The developed heterojunctions are promising for high-sensitivity, low-power direct X-ray detectors.
    • This work advances perovskite-based applications in X-ray imaging.