New insights for uniform and large-volume CdZnTe and CdMnTe detectors

Kihyun Kim, A. E. Bolotnikov, G. S. Camarda, R. Tappero, Y. Cui, A. Hossain, J. Franc, L. Marchini, A. Zappettini, P. Fochuk, R. Gul, G. Yang, R. B. James

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

CdZnTe (CZT) and CdMnTe (CMT) materials come into the spotlight for room-temperature semiconductor detectors. Nonethelss, both materials still have limitations for the production of economical, uniform, and large-volume devices due to the zinc (Zn) segregation in CZT and manganese purity in CMT. The effective segregation coefficient of Zn in the CdTe host is nearly 1.3, so about 5-6% of Zn deviation has been reported in Bridgman-grown CZT (Zn=10%) ingots. Such Zn non-uniformity limits the cutting of the ingot parallel to the crystal growth direction for producing large-volume CZT detectors due to the signal non-uniformity that would be generated by the band-gap variations. However, our recent findings show that the Zn segregation can be controlled by the specific thermal environment. The high residual impurities in the starting source materials, especially for manganese, were obstacles for obtaining high-performance CMT detectors. The purification of manganese telluride (MnTe) by a floating Te melt-zone proved to be very effective, and CMT detectors fabricated with purified material give a 2.1% energy resolution for 662 keV associated with a 137Cs gamma source.

Original languageEnglish
Title of host publication2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011
Pages4751-4755
Number of pages5
DOIs
Publication statusPublished - 2012 Mar 26
Externally publishedYes
Event2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011 - Valencia, Spain
Duration: 2011 Oct 232011 Oct 29

Publication series

NameIEEE Nuclear Science Symposium Conference Record
ISSN (Print)1095-7863

Other

Other2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011
CountrySpain
CityValencia
Period11/10/2311/10/29

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ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Radiology Nuclear Medicine and imaging

Cite this

Kim, K., Bolotnikov, A. E., Camarda, G. S., Tappero, R., Cui, Y., Hossain, A., Franc, J., Marchini, L., Zappettini, A., Fochuk, P., Gul, R., Yang, G., & James, R. B. (2012). New insights for uniform and large-volume CdZnTe and CdMnTe detectors. In 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011 (pp. 4751-4755). [6154708] (IEEE Nuclear Science Symposium Conference Record). https://doi.org/10.1109/NSSMIC.2011.6154708