Performance characteristics of CdTe drift ring detector
Performance characteristics of CdTe drift ring detector
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DOI：
10.1088/1748-0221/9/03/c03029
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发表时间：
2014-03-01
影响因子：
1.3
通讯作者：
Kachkanov, V.
中科院分区：
文献类型：
--
作者：
Alruhaili, A.;Sellin, P. J.;Kachkanov, V.
CdTe和CdZnTe材料具有良好的量子效率和室温工作特性，是制备高能X射线光谱探测器的理想材料。主要的材料限制与空穴的电荷传输性能差有关。这项工作的动机是调查与漂移环的几何形状，是不敏感的空穴传输的检测器的性能特性。报道了由Acrorad制造的具有3个漂移环的欧姆CdTe漂移环探测器的性能;测量包括室温电流电压特性（IV）和光谱性能。数据表明，探测器的能量分辨率受到泄漏电流的限制，泄漏电流是体泄漏电流和表面泄漏电流的组合。研究了金刚石光源上X射线微束的能量分辨率与入射X射线位置的关系。研究了不同的环偏置方案，结果表明，通过增加横向场（即跨环的偏置梯度），由检测到的计数率评估的有效面积显著增加。
CdTe and CdZnTe material is an excellent candidate for the fabrication of high energy X-ray spectroscopic detectors due to their good quantum efficiency and room temperature operation. The main material limitation is associated with the poor charge transport properties of holes. The motivation of this work is to investigate the performance characteristics of a detector fabricated with a drift ring geometry that is insensitive to the transport of holes. The performance of a prototype Ohmic CdTe drift ring detector fabricated by Acrorad with 3 drift rings is reported; measurements include room temperature current voltage characteristics (IV) and spectroscopic performance. The data shows that the energy resolution of the detector is limited by leakage current which is a combination of bulk and surface leakage currents. The energy resolution was studied as a function of incident X-ray position with an X-ray microbeam at the Diamond Light Source. Different ring biasing schemes were investigated and the results show that by increasing the lateral field (i.e. the bias gradient across the rings) the active area, evaluated by the detected count rate, increased significantly.