Characterization of secondary phases and other defects in CdZnTe
Characterization of secondary phases and other defects in CdZnTe
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DOI：
10.1117/12.862379
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发表时间：
2010-08
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影响因子：
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通讯作者：
M. Duff;K. Lynn;Kelly A. Jones;R. Soundararajan;J. Bradley;H. Ishii;J. Aguiar;P. Wozniakiewicz
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文献类型：
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作者：
M. Duff;K. Lynn;Kelly A. Jones;R. Soundararajan;J. Bradley;H. Ishii;J. Aguiar;P. Wozniakiewicz
半导体 CdZnTe 或“CZT”晶体非常适合用作基于室温的伽马辐射光谱仪。在过去十年中，CZT 生长方法的改进显着提高了所生产晶体的质量，但有些材料特性可能会影响这些材料作为辐射探测器的性能。例如，CZT 晶体内的各种结构异质性（例如管道、空隙、多晶性和第二相 (SP)）可能会对探测器性能产生负面影响。在这项研究中，CZT 材料是通过改进的垂直布里奇曼生长 (MVB) 方法生长的，在熔体中没有过量 Te 的情况下，采用区域水平生长。使用透射IR以0.002的体积％对许多SP进行成像。使用各种分析技术对该材料的样品进行分析，以评估其电特性、纯度和作为辐射光谱仪的检测器性能，并确定该材料中 SP 之一的形态、尺寸和元素/结构组成。人们发现这种材料具有高电阻率和良好的辐射光谱仪性能。它的 SP 富含钙 (Ca)、碳 (C) 和氧 (O)（可能是 CaCO3）或仅含有 C 和 O，直径为 5 μm 或更小。
Semiconducting CdZnTe or "CZT" crystals are very suitable for use as a room temperature-based gamma radiation spectrometer. During the last decade, modifications in growth methods for CZT have significantly improved the quality of the produced crystals however there are material features that can influence the performance of these materials as radiation detectors. For example, various structural heterogeneities within the CZT crystals, such as, pipes, voids, polycrystallinity, and secondary phases (SP) can have a negative impact on the detector performance. In this study, a CZT material was grown by the modified vertical Bridgman growth (MVB) method with zone leveled growth in the absence of excess Te in the melt. Numerous SP were imaged using transmission IR at a volume % of 0.002. Samples from this material were analyzed using various analytical techniques to evaluate its electrical properties, purity and detector performance as radiation spectrometers and to determine the morphology, dimension and elemental /structural composition of one of the SP in this material. This material was found to have a high resistivity and good radiation spectrometer performance. It had SPs that were rich in calcium (Ca), carbon (C) and oxygen (O) (possibly CaCO3) or only C and O that were 5 μm or less in diameter.