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Low Temperature Crystal Growth and Characterization of Cd0.9Zn0.1Te for Radiation Detection Applications

Published online by Cambridge University Press:  12 October 2011

Ramesh M. Krishna ,
Timothy C. Hayes ,
Peter G. Muzykov  and
Krishna C. Mandal
Ramesh M. Krishna
Affiliation:
Department of Electrical Engineering, University of South Carolina, Columbia, SC 29208, USA
Timothy C. Hayes
Affiliation:
Department of Electrical Engineering, University of South Carolina, Columbia, SC 29208, USA
Peter G. Muzykov
Affiliation:
Department of Electrical Engineering, University of South Carolina, Columbia, SC 29208, USA
Krishna C. Mandal
Affiliation:
Department of Electrical Engineering, University of South Carolina, Columbia, SC 29208, USA
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Abstract

Cd0.9Zn0.1Te (CZT) detector grade crystals were grown from zone refined Cd, Zn, and Te (7N) precursor materials, using the tellurium solvent method. These crystals were grown using a high temperature vertical furnace designed and installed in our laboratory. The furnace is capable of growing up to 8” diameter crystals, and custom pulling and ampoule rotation functions using custom electronics were furnished for this setup. CZT crystals were grown using excess Te as a solvent with growth temperatures lower than the melting temperatures of CZT (1092°C). Tellurium inclusions were characterized through IR transmittance maps for the grown CZT ingots. The crystals from the grown ingots were processed and characterized using I-V measurements for electrical resistivity, thermally stimulated current (TSC), and electron beam induced current (EBIC). Pulse height spectra (PHS) measurements were carried out using a 241 Am (59.6 keV) radiation source, and an energy resolution of ~4.2% FWHM was obtained. Our investigation demonstrates high quality detector grade CZT crystals growth using this low temperature solvent method.

Keywords

semiconductingII-VIcrystal growth
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1341: Symposium U – Nuclear Radiation Detection Materials , 2011 , mrss11-1341-u02-03
Copyright
Copyright © Materials Research Society 2011

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