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Title: Analysis of Te and TeO 2 on CdZnTe Nuclear Detectors Treated with Hydrogen Bromide and Ammonium-Based Solutions

Surface defects caused during cutting and polishing in the fabrication of cadmium zinc telluride (CdZnTe) nuclear detectors limit their spectral performance. Chemical treatments are often used to remove surface damages and defects. In this paper, we present the analysis of Te and TeO 2 species on the surfaces of CdZnTe nuclear detectors treated with hydrogen bromide and ammonium-based solutions. The CdZnTe wafers were chemo-mechanically polished in a mixture of hydrogen bromide in hydrogen peroxide and ethylene glycol, followed by a chemical passivation in a mixture of ammonium fluoride and hydrogen peroxide solution. X-ray photoelectron spectroscopy showed significant conversion of Te to TeO 2, thus producing a more chemically stable surface. The resistivity of the CdZnTe samples is in the order of 1010 ohms-cm. The current for a given applied voltage increased following the passivation and decreased after a 3-hour period. Results from spectral response measurements showed that the 59.5-keV gamma-peak of Am-241 was stable under the same channel for the surface treatment processes.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [5]
  1. Alabama A&M University, Normal, AL (United States). Department of Mechanical & Civil Engineering, and Construction Management and Department of Electrical Engineering and Computer Science
  2. Alabama A&M University, Normal, AL (United States). Department of Electrical Engineering and Computer Science and Nuclear Engineering and Radiological Science Center; Brookhaven National Lab. (BNL), Upton, NY (United States). Department of Nonproliferation and National Security
  3. Alabama A&M University, Normal, AL (United States). Nuclear Engineering and Radiological Science Center
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Department of Nonproliferation and National Security
  5. Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL). Science and Technology
Publication Date:
Report Number(s):
BNL-113860-2017-JA
Journal ID: ISSN 2327-6045
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Journal of Materials Science and Chemical Engineering
Additional Journal Information:
Journal Volume: 5; Journal Issue: 4; Journal ID: ISSN 2327-6045
Publisher:
Scientific Research Publishing, Inc.
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA), Office of Nonproliferation and Verification Research and Development (NA-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CdZnTe; Chemical Treatment; Nuclear Detectors; Surface Passivation; XPS
OSTI Identifier:
1376091