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Alkali Metal Chalcogenides for Radiation Detection

Published online by Cambridge University Press:  12 October 2011

J. A. Peters ,
Zhifu Liu ,
B. W. Wessels ,
I. Androulakis ,
C. P. Sebastian ,
Hao Li  and
M. G. Kanatzidis
J. A. Peters
Affiliation:
Materials Research Center, Northwestern University, Evanston, IL 60208
Zhifu Liu
Affiliation:
Materials Research Center, Northwestern University, Evanston, IL 60208
B. W. Wessels*
Affiliation:
Materials Research Center, Northwestern University, Evanston, IL 60208 Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208
I. Androulakis
Affiliation:
Department of Chemistry, Northwestern University, Evanston, IL 60208
C. P. Sebastian
Affiliation:
Department of Chemistry, Northwestern University, Evanston, IL 60208
Hao Li
Affiliation:
Department of Chemistry, Northwestern University, Evanston, IL 60208
M. G. Kanatzidis
Affiliation:
Department of Chemistry, Northwestern University, Evanston, IL 60208
*
*Email: b-wessels@northwestern.edu
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Abstract

We report on the optical and charge transport properties of novel alkali metal chalcogenides, Cs2Hg6S7 and Cs2Cd3Te4, pertaining to their use in radiation detection. Optical absorption, photoconductivity, and gamma ray response measurements for undoped crystals were measured. The band gap energies of the Cs2Hg6S7 and Cs2Cd3Te4 compounds are 1.63 eV and 2.45 eV, respectively. The mobility-lifetime products for charge carriers are of the order of ~10-3 cm2/V for electrons and ~10-4 cm2/V for holes. Detectors fabricated from the ternary compound Cs2Hg6S7 shows well-resolved spectroscopic features at room temperature in response to ϒ -rays at 122 keV from a 57Co source, indicating its potential as a radiation detector.

Keywords

nuclear materialsoptical propertiesphotoconductivity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1341: Symposium U – Nuclear Radiation Detection Materials , 2011 , mrss11-1341-u05-03
Copyright
Copyright © Materials Research Society 2011

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References

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