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Micro-Raman imaging of Te precipitates in CdZnTe (Zn∼4%) crystals

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5 Author(s)
Kulkarni, Gururaj Anand ; Department of Physics, Indian Institute of Science, Bangalore 560012, India ; Sathe, V.G. ; Rao, K.S.R.K. ; Muthu, D.V.S.
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Micro-Raman imaging of the distribution of Te precipitates in CdZnTe crystals in different phases is reported. For the normal phase of Te precipitates, the Raman modes appear centered around 121(A1), 141(E)/TO(CdTe) cm-1 and a weak mode around 92(E) cm-1 in CdZnTe indicating the presence of trigonal lattice of Te. Under high pressure phase, the volume of Te precipitates collapses, giving more bond energy resulting in the blueshift of the corresponding Raman bands. Also, the spatial distribution of the area ratio of 121 to 141 cm-1 Raman modes is used to quantify Te precipitates. Further, near-infrared microscopy images support these results.

Published in:

Journal of Applied Physics  (Volume:105 ,  Issue: 6 )

Date of Publication:

Mar 2009

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