Comparative Studies of CdZnTe, CdMnTe, and CdZnTeSe Materials for Room-Temperature Nuclear Detection Applications
Comparative Studies of CdZnTe, CdMnTe, and CdZnTeSe Materials for Room-Temperature Nuclear Detection Applications
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DOI：
10.1109/nss/mic44867.2021.9875638
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发表时间：
2021-10
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通讯作者：
S. Egarievwe;Stephan D. Soto;Simeon W. Sykes;Leslie J. Fuller;Quentin J. Alsbrooks;M. Alim;U. Roy;E. Agbalagba;Mebougna L. Drabro;R. James
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文献类型：
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作者：
S. Egarievwe;Stephan D. Soto;Simeon W. Sykes;Leslie J. Fuller;Quentin J. Alsbrooks;M. Alim;U. Roy;E. Agbalagba;Mebougna L. Drabro;R. James
碲化镉(CdTe)及其三元和四元化合物在开发用于核探测和医学成像应用的X射线和伽马射线探测器方面得到了应用。这些探测器的例子包括CdZnTe(CZT)、CdMnTe(CMT)和CdZnTeSe(CZTS)。这些核探测器可以在室温下工作，而不需要低温冷却。本文对这些半导体材料进行了比较研究。所研究的性质包括探测器的电阻率、Te夹杂物、晶界网络、载流子的迁移率/寿命和能量分辨率。文中还给出了用KOH和NH4F等化学物质钝化的效果。X射线光电子能谱(XPS)研究表明，在KOH和NH4F中钝化后，这些材料表面的TeO2含量增加。虽然CZT探测器具有广泛的商用价值，但与CZTS相比，它含有更多的Te夹杂物和晶界网络。CMT和CZTS比CZT具有更好的晶体均匀性。CZTS中较低的Te夹杂物和晶界网络的存在使其具有较高的探测器级材料的晶体生长产率。
Cadmium telluride (CdTe) and its ternary and quaternary compounds have found applications in the development of X-ray and gamma-ray detectors used in nuclear detection and medical imaging applications. Example of these detectors include CdZnTe (CZT), CdMnTe (CMT), and CdZnTeSe (CZTS). These nuclear detectors can operate at room temperature without cryogenic cooling. This paper presents comparative studies of these semiconductor material. The properties studied include detector resistivity, Te inclusions, grain boundary networks, mobility/lifetime of the charge carriers, and energy resolution. The effects of passivation with chemicals such as KOH and NH4F, are also presented. X-ray photoelectron spectroscopy (XPS) studies showed increase in the quantity of TeO2 on surfaces of these materials after passivation in KOH and NH4F. While CZT detector has wide commercial availability, it has more Te inclusions and grain boundary network compared to CZTS. CMT and CZTS have better crystal uniformity than CZT. The comparatively low presence of Te inclusions and grain boundary network in CZTS gives it a higher crystal growth yield for detector-grade material.