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J Instrum. 2011 Jan 11;6:C01027.

Porous Silicon-Based Quantum Dot Broad Spectrum Radiation Detector.

Author information

  • 1Weinberg Medical Physics, Bethesda, Maryland, USA.
  • 2Chemistry Department, Wayne State University, Detroit, Michigan, USA.


Silicon is a convenient and inexpensive platform for radiation detection, but has low stopping power for x-rays and gamma-rays with high energy (e.g., 100 keV, as used in computed tomography and digital radiography, or 1 MeV, as desired for detection of nuclear materials). We have effectively increased the stopping power of silicon detectors by producing a layer of porous or micro-machined silicon, and infusing this layer with semiconductor quantum dots made of electron-dense materials. Results of prototype detectors show sensitivity to infrared, visible light, and x-rays, with dark current of less than 1 nA/mm2.


infrared; lead sulfide; light; multispectrum; nanoparticles; porous silicon; quantum dot; sensor; x-ray

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