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Title: Performance-Limiting Defects in CdZnTe Detectors

Abstract

We studied the effects of small, < 20 mum, Te inclusions on the energy resolution of CdZnTe gamma-ray detectors using a highly collimated X-ray beam and gamma-rays, and modeled them via a simplified geometrical approach. Previous reports demonstrated that Te inclusions of about a few microns in diameter degraded the charge-transport properties and uniformity of CdZnTe detectors. The goal of this work was to understand the extent to which randomly distributed Te-rich inclusions affect the energy resolution of CZT detectors, and to define new steps to overcome their deleterious effects. We used a phenomenological model, which depends on several adjustable parameters, to reproduce the experimentally measured effects of inclusions on energy resolution. We also were able to bound the materials-related problem and predict the enhancement in performance expected by reducing the size and number of Te inclusions within the crystals.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
930053
Report Number(s):
BNL-80680-2008-JA
Journal ID: ISSN 0018-9499; IETNAE; TRN: US0806686
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Transactions on Nuclear Science; Journal Volume: 54
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 36 MATERIALS SCIENCE; CDTE SEMICONDUCTOR DETECTORS; ZINC TELLURIDES; PERFORMANCE; TELLURIUM; INCLUSIONS; GAMMA DETECTION; CHARGE TRANSPORT; ENERGY RESOLUTION; MATHEMATICAL MODELS; national synchrotron light source

Citation Formats

Bolotnikov,A., Camarda, G., Cui, Y., Kohman, K., Li, L., Salomon, M., and James, R.. Performance-Limiting Defects in CdZnTe Detectors. United States: N. p., 2007. Web. doi:10.1109/TNS.2007.894555.
Bolotnikov,A., Camarda, G., Cui, Y., Kohman, K., Li, L., Salomon, M., & James, R.. Performance-Limiting Defects in CdZnTe Detectors. United States. doi:10.1109/TNS.2007.894555.
Bolotnikov,A., Camarda, G., Cui, Y., Kohman, K., Li, L., Salomon, M., and James, R.. Mon . "Performance-Limiting Defects in CdZnTe Detectors". United States. doi:10.1109/TNS.2007.894555.
@article{osti_930053,
title = {Performance-Limiting Defects in CdZnTe Detectors},
author = {Bolotnikov,A. and Camarda, G. and Cui, Y. and Kohman, K. and Li, L. and Salomon, M. and James, R.},
abstractNote = {We studied the effects of small, < 20 mum, Te inclusions on the energy resolution of CdZnTe gamma-ray detectors using a highly collimated X-ray beam and gamma-rays, and modeled them via a simplified geometrical approach. Previous reports demonstrated that Te inclusions of about a few microns in diameter degraded the charge-transport properties and uniformity of CdZnTe detectors. The goal of this work was to understand the extent to which randomly distributed Te-rich inclusions affect the energy resolution of CZT detectors, and to define new steps to overcome their deleterious effects. We used a phenomenological model, which depends on several adjustable parameters, to reproduce the experimentally measured effects of inclusions on energy resolution. We also were able to bound the materials-related problem and predict the enhancement in performance expected by reducing the size and number of Te inclusions within the crystals.},
doi = {10.1109/TNS.2007.894555},
journal = {IEEE Transactions on Nuclear Science},
number = ,
volume = 54,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}