Journal of Materials Research

Articles

Characterization of heterogeneities in detector-grade CdZnTe crystals

M.C. Duffa1 c1, D.B. Huntera1, A. Burgera1, M. Grozaa1, V. Buligaa2, J.P. Bradleya1, G. Grahama1, Z.R. Daia1, N. Teslicha3, D.R. Blacka4 and A. Lanzirottia5

a1 Savannah River National Laboratory, Aiken, South Carolina 29808

a2 Fisk University, Nashville, Tennessee 37208

a3 Lawrence Livermore National Laboratory, Livermore, California 94550

a4 National Institute of Standards and Technology, Gaithersburg, Maryland 20899

a5 University of Chicago—Consortium for Advanced Radiation Sources (CARS), National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973

Abstract

Synthetic Cd1–x Zn x Te or “CZT” crystals are highly suitable for γ-spectrometers operating at room temperature. Secondary phases (SP) within CZT, presumed to be Te metal, have detrimental impacts on the charge collection efficiency of fabricated device. Using analytical techniques rather than arbitrary theoretical definitions, we identify two SP morphologies: (i) many void, 20-μm “negative” crystals with 65-nm nanoparticle residues of Si, Cd, Zn, and Te and (ii) 20-μm hexagonal-shaped bodies, which are composites of metallic Te layers with cores of amorphous and polycrystalline CZT material that surround the voids.

(Received June 04 2008)

(Accepted November 19 2008)

Key Words:

  • Second phases;
  • Semiconducting;
  • Transmission electron microscopy (TEM)

Correspondence:

c1 ddress all correspondence to this author. e-mail: martine.duff@srnl.doe.gov

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