arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.04201physics.ins-dethep-ex
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背照式电荷耦合器件的电荷收集效率

Charge collection efficiency in back-illuminated Charge-Coupled Devices

Guillermo Fernandez-Moroni, Kevin Andersson, Ana Botti, Juan Estrada, Dario Rodrigues, Javier Tiffenberg

摘要:

低噪声CCD完全耗尽高达675微米已被确定为暗物质搜索和低能中微子物理学的独特工具。这些探测器的电荷收集效率(CCE)是未来实验性能的关键参数。我们提出了一种新的技术来表征CCE的背照式CCD的软X射线的基础上。该技术用于表征两种不同的探测器设计。结果证明了背面处理对于阈值附近检测的重要性,表明几微米的复合层会显着扭曲低能谱。研究表明,部分电荷收集的区域可以减少到小于1微米的厚度与适当的背面处理。

英文摘要:

Low noise CCDs fully-depleted up to 675 micrometers have been identified as a unique tool for Dark Matter searches and low energy neutrino physics. The charge collection efficiency (CCE) for these detectors is a critical parameter for the performance of future experiments. We present here a new technique to characterize CCE in back-illuminated CCDs based on soft X-rays. This technique is used to characterize two different detector designs. The results demonstrate the importance of the backside processing for detection near threshold, showing that a recombination layer of a few microns significantly distorts the low energy spectrum. The studies demonstrate that the region of partial charge collection can be reduced to less than 1 micrometer thickness with adequate backside processing.

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