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Proceedings Paper

Study of gamma-ray detector performance of Cd1-xZnxTe crystal treated by different etchants
Author(s): Henry Chen; Stephen U. Egarievwe; Z. Hu; J. Tong; Detang T. Shi; G. H. Wu; Kuo-Tong Chen; M. A. George; W. Eugene Collins; Arnold Burger; Ralph B. James; Carl Michael Stahle; Lyle M. Bartlett
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Paper Abstract

Radiation detectors have been fabricated from Cd1-xZnxTe crystals and their performance has been studied with respect their Cd1-xZnxTe surface preparation. Energy resolution, leakage current, resistivity, ohmicity as well as surface roughness of the detectors were measured and compared for various chemical treatments. Etching in lactic acid has been found to lead to better ohmic contract, a rougher surface and higher leakage current. Bromine is effective in removing the damaged layer and when added to 20 percent lactic acid in ethylene glycol leads to a lower leakage current and consequently a better energy resolution. The best detector performance was obtained with a two step treatment consisting of a standard etchant (5 percent Br in methanol) followed by 2 percent Br in'20 percent lactic acid in ethylene glycol'. The results clearly demonstrate the important of surface chemical treatments in the fabrication of Cd1-xZnxTe radiation detectors.

Paper Details

Date Published: 19 July 1996
PDF: 9 pages
Proc. SPIE 2859, Hard X-Ray/Gamma-Ray and Neutron Optics, Sensors, and Applications, (19 July 1996); doi: 10.1117/12.245128
Show Author Affiliations
Henry Chen, Fisk Univ. (United States)
Stephen U. Egarievwe, Fisk Univ. (United States)
Z. Hu, Fisk Univ. (United States)
J. Tong, Fisk Univ. (United States)
Detang T. Shi, Fisk Univ. (United States)
G. H. Wu, Fisk Univ. (United States)
Kuo-Tong Chen, Fisk Univ. (United States)
M. A. George, Fisk Univ. (United States)
W. Eugene Collins, Fisk Univ. (United States)
Arnold Burger, Fisk Univ. (United States)
Ralph B. James, Sandia National Labs. (United States)
Carl Michael Stahle, NASA Goddard Space Flight Ctr. (United States)
Lyle M. Bartlett, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 2859:
Hard X-Ray/Gamma-Ray and Neutron Optics, Sensors, and Applications
Richard B. Hoover; F. Patrick Doty, Editor(s)

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