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Related Concept Videos

X-ray Crystallography02:18

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
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Updated: Feb 24, 2026

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High-Mobility 2D Molecular Crystals Enable Field-Effect X-Ray Detectors with Record Volumetric Sensitivity.

Yiwen Ren1, Hongyun Wang1, Yuhan Du1

  • 1State Key Laboratory of Advanced Materials for Intelligent Sensing, Key Laboratory of Organic Integrated Circuit, Ministry of Education, & Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science & Institute of Molecular Aggregation Science, Tianjin University, Tianjin, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|February 22, 2026
PubMed
Summary

Researchers developed an ultrathin, high-mobility 2D molecular crystal (2DMC) detector for portable X-ray imaging. This novel design achieves ultra-high sensitivity and low dark current, enabling low-dose medical diagnostics and imaging applications.

Keywords:
2D molecular crystalsdirect X‐ray detectionhigh sensitivitylow dark current

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Medical Imaging Technology

Background:

  • Direct X-ray detectors are crucial for portable imaging and medical diagnostics.
  • Conventional detectors often rely on thick, bulky active layers, limiting portability and integration.
  • There is a need for lightweight, low-cost, and ultra-sensitive X-ray detection solutions.

Purpose of the Study:

  • To develop a novel X-ray detector that overcomes the limitations of conventional designs.
  • To achieve high sensitivity and low dark current using an ultrathin active layer.
  • To establish new design principles for next-generation organic X-ray detectors.

Main Methods:

  • Integration of an ultrathin, high-mobility 2D molecular crystal (2DMC) into a lateral field-effect transistor.
  • Utilizing a confined in-plane carrier transport path and strong gate-electrostatic control.
  • Fabrication of large-area, uniform 2DMC arrays with operational stability.

Main Results:

  • Achieved record volumetric sensitivity (5.91 × 1010 µC Gy-1 cm-3) and a low detection limit (1.43 nGy s-1).
  • Demonstrated sub-pA dark currents due to complete carrier depletion.
  • Showcased high-contrast imaging capabilities at low doses (10.17 nGy s-1).
  • Established that high mobility is more critical than atomic number for sensitivity in ultrathin detectors.

Conclusions:

  • The ultrathin 2DMC field-effect transistor design represents a new paradigm for lightweight, low-dose organic X-ray imaging.
  • This approach surpasses conventional detector limitations, offering superior performance and integration possibilities.
  • Introduced mobility-centric design rules for the development of advanced X-ray detectors.