Size and distribution of Te inclusions in THM as-grown CZT wafers: The effect of the rate of crystal cooling

The concentration and size distribution of Te inclusions/precipitates in CZT are key factors in a device's performance. High concentrations can degrade the performance drastically, especially for long drift-length devices (more than about 10-mm thick). Here, we extend our previous findings on t...

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Bibliographic Details
Published in:Journal of crystal growth 2011-10, Vol.332 (1), p.34-38
Main Authors: Roy, U.N., Weiler, S., Stein, J., Hossain, A., Camarda, G.S., Bolotnikov, A.E., James, R.B.
Format: Article
Language:English
Subjects:
A1. Defects
A1. Gamma detectors
A2. THM
Applied sciences
B2. CdZnTe
Cooling rate
Cross-disciplinary physics: materials science
rheology
CZT
Devices
Electronics
Exact sciences and technology
Growth from melts
zone melting and refining
Inclusions
Ingots
Materials
Materials science
Methods of crystal growth
physics of crystal growth
Physics
Precipitates
Precipitation
Wafers
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Summary:The concentration and size distribution of Te inclusions/precipitates in CZT are key factors in a device's performance. High concentrations can degrade the performance drastically, especially for long drift-length devices (more than about 10-mm thick). Here, we extend our previous findings on the concentration and size distribution of Te inclusions/precipitates in CZT wafers grown by the THM technique, by considering the rate of cooling of the ingots. We measured their distribution along the diameter of the wafers in a conventional slow-cooled and a fast-cooled ingot. The overall average concentration of Te inclusions/precipitates for the slow-cooled sample was less than 1×10 5 cm −3, attesting to their suitability for fabricating thick radiation-detection devices. ► THM growth of CdZnTe and Te inclusion/precipitates mapping was carried out. ► Mapping of Te inclusions/precipitates of as-grown CZT by THM, for the first time. ► The size, distribution, and concentrations were less/comparable to the commercial CZT. ► Effect of the rate of cooling on concentration of Te inclusions/precipitates was studied.
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2011.07.025