具有组分梯度的HgCdTe探测器的光电特性研究
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中国科学院上海技术物理研究所

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国家重点研发计划


Study on photoelectric characteristics of compositionally graded HgCdTe detector
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Shanghai Institute of Technical Physics,Chinese Academy of Science

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the National key Research and Development Program of China

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    摘要:

    pn结分别制备在HgCdTe外延薄膜材料的Cd组分非线性变化区和线性变化区的高组分端,研究了具有组分梯度的HgCdTe探测器的光电特性。通过不同温度下光电性能测试,发现两个样品的归一化响应光谱和响应率随温度的变化趋势不一致。计算不同温度下的组分梯度产生的内建电场,结果显示Cd组分线性变化产生的内建电场在100V/cm~200V/cm,而Cd组分非线性变化使得样品表面薄层的内建电场高达2000V/cm,分析表明两个样品的结区所处的组分梯度产生的内建电场对光生少子运动的影响是引起光电性能随温度变化差异的主要原因,且Cd组分非线性变化引起的内建电场随温度的变化使得样品响应率呈现了三种不同的变化趋势。通过不同温度下的响应光谱和响应率分析,说明利用温度调控Cd组分非线性变化产生的内建电场,可以降低结区光生载流子浓度和提高结区内空穴漂移速度,有利于降低空间电荷效应,为大注入下提高HgCdTe探测器的饱和阈值提供了一种新的设计思路。

    Abstract:

    The junction is prepared at the high composition end of nonlinear composition region and linear composition region respectively, and the photoelectric performance of HgCdTe detector with component gradient is studied. It is found that the change of the normalized response spectrum and the responsivity with temperature is different between two samples. To calculate the built-in electric field of composition gradient in two sample at different temperatures, the results show that the built-in electric field generated by the linear composition distribution is 100V/cm ~ 200V/cm, while the built-in electric field generated by the nonlinear composition distribution makes the electric field on surface of the sample as high as 2000V/cm. The analysis indicates that the influence of the built-in electric field generated by composition gradient in the junction of the two samples on the movement of the minority carrier is the main reason for the difference of the photoelectric performance with temperature, and the built-in electric field generated by the nonlinear composition distribution changing with temperature makes the responsivity of the sample show three different trends. Through the analysis of response spectrum and responsivity with different temperatures, it is shown that using the built-in electric field generated by the nonlinear composition distribution which is controlled by temperature can reduce the concentration of photogenerated carriers in the junction region and increase the hole drift speed in the junction region, which is conducive to reducing space charge effect and provides a new design idea for improving the saturation threshold of HgCdTe detector under large injection.

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  • 收稿日期:2022-07-05
  • 最后修改日期:2022-08-04
  • 录用日期:2022-09-05
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