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Proceedings Paper

Synchrotron radiation x-ray absorption fine-structure and Raman studies on CdZnTe ternary alloys
Author(s): Yu Li Wu; Yen-Ting Chen; Zhe Chuan Feng; Jyh-Fu Lee; P. Becla; Weijie Lu
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Paper Abstract

The synchrotron radiation (SR) X-ray absorption fine-structure spectroscopy (XAFS) technology has been employed to obtained Zn K-edge absorption spectra for Cd11-xZnxTe alloy with x = 0.03, 0.10, 0.20, 0.30, 0.40, 0.50 and 1.00. Their Fourier transform spectra were analyzed, which have shown a bimodal distribution of bond lengths, suggesting distortion of the Te sub-lattice, so that the linear interpolation is true only in an approximate sense. Synthetic CdZnTe crystals can be used for the room temperature-based detection of gamma radiation. The radiation detection properties of CZT crystals vary widely. A common defect found in most high-quality CZT crystals is Te secondary phases, often located along grain boundaries. The secondary phases can be both large inclusions (>50 μm) and smaller precipitates (<50 μm). The Te secondary phases distributed throughout the crystal can cause changes to the detector leakage current, resulting in decreased radiation spectrometer performance. This set of Cd1-xZnxTe crystals were also measured by Raman scattering at room temperature. The two observed peaks at about 125 and 145 cm-1 which can be assigned to Te A1 and E phonon mode, respectively. The induced damage on the crystal surfaces by Raman laser has been discussed. It is suggested that in the case of highly Zn doping CdZnTe crystals, the ZnTe bond were broken by laser exposing and then free Te atoms are migrating to these heated areas which cause Te precipitate. Further, the results of the soft X-ray measurements have been also presented and this part of the experimental data needs to do more penetrating analysis in the future.

Paper Details

Date Published: 11 September 2009
PDF: 11 pages
Proc. SPIE 7449, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XI, 74490Q (11 September 2009); doi: 10.1117/12.825823
Show Author Affiliations
Yu Li Wu, National Taiwan Univ. (Taiwan)
Yen-Ting Chen, National Taiwan Univ. (Taiwan)
Zhe Chuan Feng, National Taiwan Univ. (Taiwan)
Jyh-Fu Lee, National Synchrotron Radiation Research Ctr. (Taiwan)
P. Becla, Francis Bitter National Magnet Lab., MIT (United States)
Weijie Lu, Fisk Univ. (United States)

Published in SPIE Proceedings Vol. 7449:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XI
Ralph B. James; Larry A. Franks; Arnold Burger, Editor(s)

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