Roadmap for high efficiency solid-state neutron detectors

R. J. Nikolić, C. L. Cheung, C. E. Reinhardt, T. F. Wang

Research output: Contribution to journalConference articlepeer-review

35 Scopus citations


Solid-state thermal neutron detectors are generally fabricated in a planar configuration by coating a layer of neutron-to-alpha converter material onto a semiconductor. The as-created alpha particles in the material are expected to impinge the semiconductor and create electron-hole pairs which provide the electrical signal. These devices are limited in efficiency to a range near (2-5%)/cm 2 due to the conflicting thickness requirements of the converter layer. In this case, the layer is required to be thick enough to capture the incoming neutron flux while at the same time adequately thin to allow the alpha particles to reach the semiconductor. A three dimensional matrix structure has great potential to satisfy these two requirements in one device. Such structures can be realized by using PIN diode pillar elements to extend in the third dimension with the converter material filling the rest of the matrix. Our strategy to fabricate this structure is based on both "top-down" and "bottom-up" approaches. The "top down" approach employs high-density plasma etching techniques, while the "bottom up" approach draws on the growth of nanowires by chemical vapor deposition. From our simulations for structures with pillar diameters from 2 μm down to 100 nm, the detector efficiency is expected to increase with a decrease in pillar size. Moreover, in the optimized configuration, the detector efficiency could be higher than 75%/cm 2. Finally, the road map for the relationship between detector diameter and efficiency will be outlined.

Original languageEnglish (US)
Article number601305
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2005
EventOptoelectronic Devices: Physics, Fabrication, and Application II - Boston, MA, United States
Duration: Oct 24 2005Oct 25 2005


  • Alpha
  • Boron
  • High density plasma etching
  • Nanowires
  • Neutron detection
  • Pillars
  • Pixel array

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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