光伏型HgCdTe阵列探测器的电学串扰  

Electrical Crosstalk of Photovoltaic HgCdTe Array Detector

作　　者：乔帅 王睿[1,2,3] 侯孝成 Qiao Shuai;Wang Rui;Hou Xiaocheng(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,Hunan,China;Nanhu Laser Laboratory,National University of Defense Technology,Changsha 410073,Hunan,China;State Key Laboratory of Pulsed Power Laser Technology,National University of Defense Technology,Changsha 410073,Hunan,China)

机构地区：[1]国防科技大学前沿交叉学科学院,湖南长沙410073 [2]国防科技大学南湖之光实验室,湖南长沙410073 [3]国防科技大学脉冲功率激光技术国家重点实验室,湖南长沙410073

出　　处：《光学学报》2023年第4期9-17,共9页Acta Optica Sinica

摘　　要：阵列探测器单元间的串扰是影响探测效果的重要因素,研究探测器的串扰机理及其抑制措施有助于优化探测器性能。针对激光辐照线阵HgCdTe探测器实验中的串扰现象,使用COMSOL Multiphysics有限元仿真软件建立了激光辐照探测器的三维仿真模型,通过模拟芯片内载流子浓度分布、光电流和电场,揭示了电学串扰的产生机理,并针对该器件提出了沟槽隔离的抑制串扰措施。研究结果表明:光生载流子沿线阵排列方向的横向扩散是造成被辐照像元附近像元串扰的直接因素,但对距离辐照区域较远的像元影响较小;公共P极电压降低是导致距离辐照区域较远的像元产生响应的根本原因。此外,仿真结果验证了提出的沟槽隔离措施对电学串扰具有显著的抑制效果。Objective The crosstalk effect has always been one of the challenging issues in detector performance.Due to the increase in the detector array scale and the decrease in pixel center distance,the spatial resolution of the detectors greatly improves,and the crosstalk effect becomes more obvious,with a significant impact on the performance of the detectors.The crosstalk effect considers the problem of signals produced in the target pixel being interfered by some factors and makes other pixels to produce response signals.Crosstalk can be divided into optical crosstalk and electrical crosstalk based on different generation mechanisms.Optical crosstalk refers to the optical factors such as light reflection,refraction,and diffraction that make signals appear in other pixels.Electrical crosstalk refers to the signal response of other pixels due to the diffusion of photogenerated carriers.HgCdTe detector is widely used in both civil and military fields because of its high sensitivity,broad coverage band range,and other advantages.The crosstalk phenomenon exists in array HgCdTe detectors under continuous laser or pulsed laser irradiation,according to a lot of recent studies on the laser irradiation effect of HgCdTe array detectors.Previous research has shown that optical crosstalk is not the primary mechanism driving the response of unirradiated pixels in array devices,and it is inferred that this response is caused by electrical crosstalk.However,the conclusion has not been verified systematically.In this study,a linear HgCdTe array detector is used as the research subject,and we try to explore the mechanism and degree of electrical crosstalk as well as practical strategies for reducing it.In addition,we expect that these findings can have a certain reference value for improving the performance of detectors.Methods We use COMSOL Multiphysics finite element simulation software to establish a three-dimensional simulation model of a pulsed laser irradiation detector chip and study the crosstalk problem in a laser irradiation

关 键 词：探测器 HGCDTE 电学串扰 串扰机理 沟槽隔离 

分 类 号：TN215[电子电信—物理电子学]