Study of gamma-ray detector performance of Cd1-xZnxTe crystal treated by different etchants

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

doi:10.1117/12.245128

19 July 1996 Study of gamma-ray detector performance of Cd_1-xZn_xTe crystal treated by different etchants

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

Author Affiliations +

Proceedings Volume 2859, Hard X-Ray/Gamma-Ray and Neutron Optics, Sensors, and Applications; (1996) https://doi.org/10.1117/12.245128
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Radiation detectors have been fabricated from Cd_1-xZn_xTe crystals and their performance has been studied with respect their Cd_1-xZn_xTe 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 Cd_1-xZn_xTe radiation detectors.

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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, and Lyle M. Bartlett "Study of gamma-ray detector performance of Cd_1-xZn_xTe crystal treated by different etchants", Proc. SPIE 2859, Hard X-Ray/Gamma-Ray and Neutron Optics, Sensors, and Applications, (19 July 1996); https://doi.org/10.1117/12.245128

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