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Additive Engineering for Ambient Blade-Coated CsPbBr3 Films Enabling High-Performance Self-Powered X-Ray Detection.

Jiahui Chen1, Xianglong Wei1, Siyin Hu1

  • 1College of Materials Science and Engineering, Fuzhou University, Fuzhou, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|March 26, 2026
PubMed
Summary

This study introduces a novel additive engineering method for fabricating high-performance, self-powered perovskite X-ray detectors in a single step. The new CsPbBr3 films exhibit reduced dark current and enhanced sensitivity for efficient radiation detection.

Keywords:
X‐ray detectorsadditive engineeringperovskitesself‐powered, blade‐coated

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Detector Physics

Background:

  • Hybrid perovskite materials offer superior charge carrier mobility and low trap-state density for radiation detection.
  • Self-powered perovskite X-ray detectors are in demand for their efficiency, low power consumption, and portability, contrasting with bias-dependent devices.
  • Current high-performance self-powered detectors often require complex secondary crystal growth post-deposition.

Purpose of the Study:

  • To develop a facile, single-step fabrication method for high-performance self-powered perovskite X-ray detectors.
  • To improve the stability and performance of cesium lead bromide (CsPbBr3) films through additive engineering.
  • To enhance the sensitivity and reduce the dark current of perovskite X-ray detectors for practical applications.

Main Methods:

  • Employed 4-trifluoromethyphenylammonium iodide (CF3PhAI) as an additive to control perovskite crystallization.
  • Fabricated single-step microcrystalline CsPbBr3 films with large grain sizes (up to 38.6 µm).
  • Utilized a low-work-function aluminum (Al) top electrode to enhance the built-in electric field.

Main Results:

  • Achieved single-step fabrication of CsPbBr3 films with grain sizes up to 38.6 µm.
  • Reduced dark current drift by nearly two orders of magnitude (from 4.135 × 10⁻¹² to 4.167 × 10⁻¹⁴ A s⁻¹).
  • Obtained a remarkable zero-bias sensitivity of 1.3 × 10³ µC Gyair⁻¹ cm⁻² with the Al top electrode.

Conclusions:

  • Additive engineering with CF3PhAI enables efficient, single-step fabrication of high-quality CsPbBr3 films for X-ray detection.
  • The developed self-powered perovskite X-ray detectors demonstrate significantly improved stability and high sensitivity.
  • This advancement paves the way for practical applications of high-performance, energy-saving perovskite X-ray detectors.