High-Efficiency CdZnTe Gamma-Ray Detectors

A. E. Bolotnikov, K. Ackley, G. S. Camarda, Y. Cui, J. F. Eger, G. De Geronimo, C. Finfrock, J. Fried, A. Hossain, Won Ho Lee, M. Prokesch, M. Petryk, J. L. Reiber, U. Roy, E. Vernon, G. Yang, R. B. James

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


The longer electron lifetime of today's CdZnTe (CZT) crystals allows for free carriers to travel longer distances in the crystals, which means that, in principle, thicker devices could be fabricated. These thicker CZT devices would offer greater detection efficiency for high-energy gamma-ray detectors. However, up to now, the thicknesses and sizes of actual detectors have still been limited by the nonuniform detector response, and the biggest devices reported in the literature are {(20times 20times 15)}hbox{-mm}3 pixelated detectors with a drift distance of 15 mm. Although thicker and bigger single crystals are becoming available today, the high requirements on their crystal quality drastically reduce their acceptance yield and increase their cost. Fortunately, in many cases, the inhomogeneity in response can be corrected by segmenting the active volumes of the detectors and correcting the responses generated from each of the voxels. Such high-granularity position-sensitive detectors open up the opportunity for using thicker and less-expensive CZT crystals. The goal of this work is to demonstrate that today's commercial high electron mobility-lifetime CZT material is suitable for a new class of detectors with 20-25-mm drift distances and even larger in the near future, provided that the detectors' response nonuniformities can be corrected on a scale comparable to or larger than the sizes of the electron clouds, which is sim 100muhbox{m}.

Original languageEnglish
Article number7348747
Pages (from-to)3193-3198
Number of pages6
JournalIEEE Transactions on Nuclear Science
Issue number6
Publication statusPublished - 2015 Dec 1


  • CdZnTe
  • charge-loss correction
  • crystal defects
  • virtual Frisch-grid detectors

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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