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Title: Investigation of the Charge Collection Efficiency of CdMnTe Radiation Detectors

Abstract

This paper presents the growth, fabrication and characterization of indium-doped cadmium manganese telluride (CdMnTe) crystals grown by the vertical Bridgman technique. The 10 x 10 x 1.9 mm{sup 3} samples have been fabricated, and the charge collection properties of the CdMnTe detectors have been measured. Alpha-particle spectroscopy measurements have yielded an average charge collection efficiency approaching 100%. Ion beam induced charge (IBIC) measurements have been performed by raster scanning focused 5.5 MeV {sup 4}He beams onto the detectors. Spatially resolved charge collection efficiency maps have been produced for a range of detector bias voltages. Inhomogeneities in the charge transport of the CdMnTe crystals have been associated with chains of Te inclusions within the detector bulk, and the reduction in charge collection efficiency in their locality has been quantified. It has been shown that the role of Te inclusions in degrading charge collection is reduced with increasing values of bias voltage. IBIC measurements for a range of low biases have highlighted the evolution of the charge collection uniformity across the detectors.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE SC OFFICE OF SCIENCE (SC)
OSTI Identifier:
1048210
Report Number(s):
BNL-98391-2012-JA
Journal ID: ISSN 0018-9499; IETNAE; NN2001000; TRN: US1204155
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Nuclear Science
Additional Journal Information:
Journal Volume: 59; Journal Issue: 3; Journal ID: ISSN 0018-9499
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 60 APPLIED LIFE SCIENCES; CADMIUM; CHARGE COLLECTION; CHARGE TRANSPORT; EFFICIENCY; FABRICATION; ION BEAMS; MANGANESE TELLURIDES; RADIATION DETECTORS; SPECTROSCOPY

Citation Formats

Bolotnikov, A, Rafiei, R, Boardman, D, Sarbutt, A, Prokopovich, A, Kim, K, Reinhard, M I, and James, R B. Investigation of the Charge Collection Efficiency of CdMnTe Radiation Detectors. United States: N. p., 2012. Web.
Bolotnikov, A, Rafiei, R, Boardman, D, Sarbutt, A, Prokopovich, A, Kim, K, Reinhard, M I, & James, R B. Investigation of the Charge Collection Efficiency of CdMnTe Radiation Detectors. United States.
Bolotnikov, A, Rafiei, R, Boardman, D, Sarbutt, A, Prokopovich, A, Kim, K, Reinhard, M I, and James, R B. Fri . "Investigation of the Charge Collection Efficiency of CdMnTe Radiation Detectors". United States.
@article{osti_1048210,
title = {Investigation of the Charge Collection Efficiency of CdMnTe Radiation Detectors},
author = {Bolotnikov, A and Rafiei, R and Boardman, D and Sarbutt, A and Prokopovich, A and Kim, K and Reinhard, M I and James, R B},
abstractNote = {This paper presents the growth, fabrication and characterization of indium-doped cadmium manganese telluride (CdMnTe) crystals grown by the vertical Bridgman technique. The 10 x 10 x 1.9 mm{sup 3} samples have been fabricated, and the charge collection properties of the CdMnTe detectors have been measured. Alpha-particle spectroscopy measurements have yielded an average charge collection efficiency approaching 100%. Ion beam induced charge (IBIC) measurements have been performed by raster scanning focused 5.5 MeV {sup 4}He beams onto the detectors. Spatially resolved charge collection efficiency maps have been produced for a range of detector bias voltages. Inhomogeneities in the charge transport of the CdMnTe crystals have been associated with chains of Te inclusions within the detector bulk, and the reduction in charge collection efficiency in their locality has been quantified. It has been shown that the role of Te inclusions in degrading charge collection is reduced with increasing values of bias voltage. IBIC measurements for a range of low biases have highlighted the evolution of the charge collection uniformity across the detectors.},
doi = {},
url = {https://www.osti.gov/biblio/1048210}, journal = {IEEE Transactions on Nuclear Science},
issn = {0018-9499},
number = 3,
volume = 59,
place = {United States},
year = {2012},
month = {6}
}