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Egarievwe, S.U., Okwechime, I.O., Hossain, A., Jow, J.O., Hales, Z.M., Egarievwe, A.A., Roy, U.N. and James, R.B. (2014) Comparative Study on the Effects of Chemical Treatments on CdZnTe Nuclear Detectors. Nuclear Science Symposium and Medical Imaging Conference, Seattle, 8-15 November 2014, 1-5.
https://doi.org/10.1109/nssmic.2014.7431279

has been cited by the following article:

• TITLE: Analysis of Te and TeO2 on CdZnTe Nuclear Detectors Treated with Hydrogen Bromide and Ammonium-Based Solutions

  AUTHORS: Mebougna L. Drabo, Stephen U. Egarievwe, Ifechukwude O. Okwechime, Dominique E. Jones, Anwar Hossain, Ralph B. James

  KEYWORDS: CdZnTe, Chemical Treatment, Nuclear Detectors, Surface Passivation, XPS

  JOURNAL NAME: Journal of Materials Science and Chemical Engineering, Vol.5 No.4, April 30, 2017

  ABSTRACT: 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 TeO2 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 TeO2, 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.