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The Effect of Low-Temperature Annealing on a CdZnTe Detector

Authors
Kim, K. H.Hwang, SeokjinFochuk, PetroNasi, L.Zappettini, AndreaBolotnikov, A. E.James, R. B.
Issue Date
8월-2016
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords
CdTeO3; CdZnTe; gamma-ray detector; low temperature annealing; seedless THM
Citation
IEEE TRANSACTIONS ON NUCLEAR SCIENCE, v.63, no.4, pp.2278 - 2282
Indexed
SCIE
SCOPUS
Journal Title
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
Volume
63
Number
4
Start Page
2278
End Page
2282
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/88024
DOI
10.1109/TNS.2016.2583546
ISSN
0018-9499
Abstract
It is known that low temperature annealing at below 200 degrees C decreases the leakage current in a CdTe and CdZnTe (CZT) detector. However, only CZT detectors which have electrodes made by electroless method and low temperature annealing in the air showed diminished leakage current after annealing. With the aid of an in-situ annealing monitoring system, we measured the leakage current of a CZT detector while carrying out low-temperature annealing. A decrease in the leakage current resulted from the presence of thin insulating Te oxide layers, TeO2 and CdTeO3, instead of CZT/electrode interface enhancement by diffusion of Au. Other measurement results of Auger electron spectroscopy, micro TEM analysis, and pulse height spectrum were in good agreement with our new interpretation of the low temperature annealing effects of CZT.
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