The cross-talk problem in SiPMs and their use as light sensors for imaging atmospheric Cherenkov telescopes
The cross-talk problem in SiPMs and their use as light sensors for imaging atmospheric Cherenkov telescopes
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DOI：
10.1016/j.nima.2009.05.150
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发表时间：
2009-10-21
影响因子：
1.4
通讯作者：
Teshima, M.
中科院分区：
文献类型：
--
作者：
Buzhan, P.;Dolgoshein, B.;Teshima, M.
SiPM的主要缺点之一是由于所谓的串扰效应。通常，链式反应中的一个光子可以产生更多的光子，因此可以激发SiPM的一个以上的微单元。这可以被认为是信号倍增过程中的噪声，并且这降低了信噪比。在自触发方案中，这种噪声可能很高，以至于在低阈值设置下难以操作它们。在过去几年中，我们一直在考虑这种影响，目的是在设计阶段抑制它。可以使用（a）微单元周围的沟槽来抑制直接光子“通信”通道，以及（B）所谓的双p-n结来抑制相邻像素中的光子感应电荷“通信”。低串扰是强制性的，例如，用于为地基伽马射线天体物理学的成像大气切伦科夫技术项目生产基于SiPM的光传感器模块。我们生产并测试了几个由4个SiPM组成的模块，每个模块的尺寸为5 mm x 5 mm，属于定制生产类型。我们在这里报告这些单位的主要参数。(C)2009 Elsevier B. V.保留所有权利。
One of the major drawbacks of a SiPM is due to the so-called cross-talk effect. Often, one single photon in a chain reaction can generate more photons and thus can fire more than one micro-cell of a SiPM. This can be considered as a noise in the signal multiplication process and this degrades the signal/noise ratio. In self-trigger schemes this noise can be so high that it can make operating them difficult at low threshold settings. For the past few years, we have dwelt on this effect aiming to suppress it at the design stage. One can use (a) trenches around the micro-cells for suppressing the direct photon "communication" channel and (b) the so-called double p-n junction for suppressing photon-induced charge "communication" in neighbor pixels. The low cross-talk is mandatory, for example, for producing SiPM-based light sensor modules for the Imaging Atmospheric Cherenkov Technique projects for ground-based gamma-ray astrophysics. We produced and tested a few modules consisting of 4 SiPMs, each with a size of 5 mm x 5 mm of custom production type. We report here on the main parameters of these units. (C) 2009 Elsevier B.V. All rights reserved.