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Title: Analysis of Surface Chemistry and Detector Performance of Chemically Process CdZnTe crystals

The goal is to produce non-conductive smooth surfaces for fabricating low-noise and high-efficiency CdZnTe devices for gamma spectroscopy. Sample preparation and results are discussed. The researachers demonstrated various bulk defects (e.g., dislocations and sub-grain boundaries) and surface defects, and examined their effects on the performance of detectors. A comparison study was made between two chemical etchants to produce non-conductive smooth surfaces. A mixture of bromine and hydrogen peroxide proved more effective than conventional bromine etchant. Both energy resolution and detection efficiency of CZT planar detectors were noticeably increased after processing the detector crystals using improved chemical etchant and processing methods.
Authors:
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Publication Date:
OSTI Identifier:
1224773
Report Number(s):
BNL--108504-2015-CP
R&D Project: 20062; NN2001
DOE Contract Number:
SC00112704
Resource Type:
Conference
Resource Relation:
Conference: The U.S. Workshop on the Physics and Chemistry of II-VI Materials; Chicago, IL; 20151005 through 20151008
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; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY CdZnTe crystals