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Metal-Halide Perovskite Submicrometer-Thick Films for Ultra-Stable Self-Powered Direct X-Ray Detectors.

Marco Girolami1, Fabio Matteocci2, Sara Pettinato3,4

  • 1CNR-ISM, Consiglio Nazionale delle Ricerche, Istituto di Struttura della Materia, Sede Secondaria di Montelibretti, DiaTHEMA Lab, Strada Provinciale 35D, 9, 00010, Montelibretti, Rome, Italy. marco.girolami@ism.cnr.it.

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|April 26, 2024
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Summary

Metal-halide perovskite X-ray detectors show remarkable stability, operating for 26 days with negligible signal loss. These self-powered devices exhibit high radiation hardness and record sensitivity for advanced X-ray detection applications.

Keywords:
Direct X-ray detectorsMedical linear acceleratorMetal-halide perovskite thin filmsOperational stabilitySelf-powered devices

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Area of Science:

  • Materials Science
  • Detector Physics
  • Solid-State Physics

Background:

  • Metal-halide perovskites are emerging as promising materials for X-ray detectors due to their sensitivity, speed, and cost-effectiveness.
  • Self-powered operation has been demonstrated, but long-term stability and radiation hardness under continuous X-ray exposure remain significant challenges.

Purpose of the Study:

  • To develop and evaluate self-powered direct X-ray detectors based on FAPbBr3 perovskite thin films with ultra-high operational stability and radiation hardness.
  • To achieve record sensitivity for thin-film X-ray detectors operating at zero bias voltage.

Main Methods:

  • Fabrication of self-powered direct X-ray detectors using FAPbBr3 submicrometer-thick films on mesoporous TiO2 scaffolds.
  • Long-term operational testing under continuous X-ray exposure for 26 days.
  • Assessment of structural integrity and radiation hardness after exposure to a total ionizing dose of approximately 200 Gy.
  • Characterization of detector performance, including sensitivity and repeatability, utilizing trap-assisted photoconductive gain.

Main Results:

  • The developed detectors demonstrated negligible signal loss after 26 days of uninterrupted X-ray exposure, showcasing ultra-high operational stability and excellent repeatability.
  • No structural modifications were observed after irradiation, indicating high radiation hardness for the metal-halide perovskite thin film.
  • A record bulk sensitivity of 7.28 C Gy⁻¹ cm⁻³ at 0 V was achieved, attributed to trap-assisted photoconductive gain.
  • Prototypal validation was successfully performed using an X-ray beam from a medical linear accelerator.

Conclusions:

  • Metal-halide perovskite thin-film X-ray detectors offer exceptional long-term operational stability and radiation hardness, overcoming previous limitations.
  • The demonstrated high sensitivity and self-powered operation at zero bias voltage position these detectors as a leading technology for advanced X-ray imaging and detection.
  • These findings pave the way for robust, portable, and cost-effective X-ray detection systems, including applications in medical diagnostics and treatment monitoring.