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Related Experiment Videos

CdZnTe array detectors for synchrotron radiation applications.

S S Yoo1, G Jennings, P A Montano

  • 1Department of Physics, University of Illinois at Chicago, Chicago, IL 60607-70592, USA.

Journal of Synchrotron Radiation
|May 12, 2006
PubMed
Summary
This summary is machine-generated.

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See all related articles

High-pressure Bridgman-grown Cadmium Zinc Telluride (CdZnTe) detectors show low dark current and good energy resolution for X-ray imaging. These detectors are suitable for advanced applications like high-energy diffraction.

Area of Science:

  • Materials Science
  • Semiconductor Physics
  • X-ray Detection Technology

Background:

  • Cadmium Zinc Telluride (CdZnTe) is a promising semiconductor material for radiation detection.
  • Developing high-performance X-ray detectors is crucial for various scientific applications.
  • Previous CdZnTe detectors faced challenges like low energy resolution due to charge carrier trapping.

Purpose of the Study:

  • To fabricate and characterize an X-ray linear-array detector using high-pressure Bridgman-grown CdZnTe.
  • To evaluate the detector's performance, including dark current, energy resolution, and charge sharing effects.
  • To assess the suitability of the detector for high-energy diffraction and Compton scattering measurements.

Main Methods:

  • Fabrication of a linear-array detector with specific dimensions (175 x 800 µm area, 250 µm pitch) using high-pressure Bridgman-grown CdZnTe.

Related Experiment Videos

  • Measurement of dark current and energy spectra using a 57Co radiation source.
  • Investigation of small-pixel effects, charge sharing, and the impact of grounding unwanted charges.
  • Development of a prototype readout electronic system.

    • Main Results:

    • Achieved a low dark current of 0.1 pA at 800 V cm⁻¹ with excellent uniformity.
    • Obtained an average 5.8% full width at half maximum (FWHM) at the 122 keV photopeak with a standard deviation of 0.2%.
    • Observed and significantly reduced charge sharing below 60 keV by implementing a grounding path for unwanted charges.

    Conclusions:

    • The fabricated CdZnTe linear-array detector demonstrates excellent performance characteristics, including low dark current and good energy resolution.
    • The study successfully addressed charge sharing issues, enhancing detector reliability.
    • The developed detector is well-suited for demanding applications such as high-energy diffraction and Compton scattering at facilities like the Advanced Photon Source.