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红外与毫米波学报 2007

中波双色光伏型HgCdTe红外探测器模拟研究

Keywords: 碲镉汞,中波双色红外探测器,光谱响应,串音,结电容,中波,双色,光伏型,HgCdTe,红外探测器,模拟研究,DETECTORS,MIDDLE,MODELING,pixel,结电容,单元,主导因素,抑制作用,载流子扩散,阻挡层,扩散效应,近似,吸收比,辐射

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Abstract:

基于二维数值模型,对光伏型中波(MW1/MW2)HgCdTe双色红外探测器作了模拟计算,器件采用n-p-p-p-n结构、同时工作模式.计算了双色器件光谱响应及量子效率,重点分析了两个波段间的信号串音问题,以及高组分势垒层的作用.模拟结果显示,MW1(中波1,波长较短)对MW2(中波2,波长较长)的串音是辐射透过MW1区在MW2区中吸收引起的,串音与光吸收比近似成正比,而载流子扩散效应可以忽略不计.高组分阻挡层对载流子扩散引起的串音有显著的抑制作用,如果没有势垒层,载流子扩散引起的串音十分明显,甚至成为串音的主导因素.对于60×60μm2探测单元MW1和MW2的结电容大约为1.75pF/pixel.

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