Crystal defects and charge collection in CZT x-ray and gamma detectors

L. Marchini, A. Zappettini, M. Zha, N. Zambelli, A. Bolotnikov, G. Camarda, R. James
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引用次数: 6

Abstract

Cadmium Zinc Telluride (CZT) is one of the most exploited materials for x-ray and gamma ray radiation detection. Nevertheless CZT ingots are still affected by many defects, the most common features are Te inclusions, dislocations and grain boundaries. In this work the results of many investigation techniques are put together and compared in order to have a better understanding of the role of each defect in the degradation of the detector performances. A CZT ingot grown by low pressure Bridgman technique in IMEM Institute, Parma, was analyzed. The material was studied by means of the IR microscopy, for the identification of Te inclusions and then studied with the use of the synchrotron light source (NSLS National Synchrotron Light Source) for the analysis of the crystalline structure and uniformity of the x-ray response.
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CZT x射线和伽马探测器中的晶体缺陷和电荷收集
碲化镉锌(CZT)是x射线和伽马射线辐射探测中开发最多的材料之一。尽管如此,CZT铸锭仍然存在许多缺陷,最常见的是夹杂物、位错和晶界。在这项工作中,将许多研究技术的结果放在一起并进行比较,以便更好地理解每个缺陷在探测器性能退化中的作用。对帕尔马IMEM研究所用低压布里奇曼法生长的CZT钢锭进行了分析。采用红外显微镜对材料进行了研究,鉴定了Te夹杂物,然后使用同步加速器光源(NSLS National synchrotron light source)对材料进行了晶体结构和x射线响应均匀性分析。
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