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Related Concept Videos

Determination of Crystal Structures01:29

Determination of Crystal Structures

139
In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
139

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Development of an amorphous selenium-based photodetector driven by a diamond cold cathode.

Tomoaki Masuzawa1, Ichitaro Saito, Takatoshi Yamada

  • 1Department of Material Science, International Christian University, 181-8585 Tokyo, Japan. kenokano@icu.ac.jp.

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Amorphous-selenium photodetectors offer high sensitivity and fast response for imaging. Researchers developed a prototype using amorphous-selenium and a diamond cold cathode, demonstrating potential for wide-wavelength detection.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Solid-State Physics

Background:

  • Amorphous-selenium (a-Se) photodetectors exhibit high spatial resolution, rapid response, and exceptional sensitivity due to internal carrier multiplication.
  • a-Se demonstrates sensitivity across visible, ultraviolet (UV), and X-ray wavelengths, leading to proposals for a-Se based flat-panel X-ray detectors.

Purpose of the Study:

  • To develop an ultra-high sensitivity photodetector with a broad detectable wavelength range.
  • To fabricate and characterize a novel photodetector integrating amorphous-selenium and a nitrogen-doped diamond cold cathode.

Main Methods:

  • Fabrication of a prototype photodetector utilizing an amorphous-selenium photoconductor.
  • Integration of a nitrogen-doped diamond cold cathode with the amorphous-selenium layer.
  • Characterization of the photodetector's response to visible and ultraviolet light.

Main Results:

  • A prototype photodetector was successfully developed.
  • The device demonstrated responsiveness to both visible and ultraviolet light.
  • The combination of a-Se and diamond cathode shows promise for enhanced photodetector performance.

Conclusions:

  • The developed photodetector, using amorphous-selenium and a nitrogen-doped diamond cold cathode, represents a step towards ultra-high sensitivity imaging devices.
  • Further characterization across a wider spectrum, including X-ray, is warranted.
  • This hybrid approach holds potential for next-generation photodetectors.