Effect of twin boundaries on the spectroscopic performance of CdZnTe detectors
Effect of twin boundaries on the spectroscopic performance of CdZnTe detectors
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DOI：
10.1117/12.450743
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发表时间：
2001-12
期刊：
影响因子：
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通讯作者：
B. Parker;C. Stahle;D. Roth;S. Babu;J. Tueller;Glenn Research Center
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文献类型：
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作者：
B. Parker;C. Stahle;D. Roth;S. Babu;J. Tueller;Glenn Research Center
高压Bridgman（HPB）法生长的碲锌镉（CdZnTe）单晶中，大多数晶粒含有多个孪晶界。因此，孪晶界是一种最常见的宏观材料缺陷中发现的大面积（400至700平方毫米）CdZnTe试样从HPB锭。由于双边界的普遍存在，了解它们对探测器性能的影响是材料选择过程的关键。在几个2毫米厚的大面积试样的孪晶边界首次记录使用红外透射成像。然后将这些样品制成2mm像素或平面探测器，以检查双边界对探测器性能的影响。初步结果表明，孪晶界，这是装饰碲夹杂物，产生探测器的效率降低和分辨率下降。退化的程度似乎是碲夹杂物的密度的函数。
Most single grains in cadmium zinc telluride (CdZnTe) grown by the high-pressure Bridgman (HPB) technique contain multiple twin boundaries. As a consequence, twin boundaries are one of the most common macroscopic material defects found in large area (400 to 700 mm2) CdZnTe specimens obtained from HPB ingots. Due to the prevalence of twin boundaries, understanding their effect on detector performance is key to the material selection process. Twin boundaries in several 2 mm thick large area specimens were first documented using infrared transmission imaging. These specimens were then fabricated into either 2mm pixel or planar detectors in order to examine the effect of the twin boundaries on detector performance. Preliminary results show that twin boundaries, which are decorated with tellurium inclusions, produce a reduction in detector efficiency and a degradation in resolution. The extent of the degradation appears to be a function of the density of tellurium inclusions.