Potential application of HgCdTe detector with composition gradient in laser measurement

XU Guoqing; WANG Reng; CHEN Xintian; QIAO Hui; YANG Xiaoyang; CHU Kaihui; WANG Dahui; YANG Pengling; LI Xiangyang

doi:10.5768/JAO202445.0310009

Journal of Applied Optics > 2024 > 45(3): 549-556. > DOI: 10.5768/JAO202445.0310009

XU Guoqing, WANG Reng, CHEN Xintian, QIAO Hui, YANG Xiaoyang, CHU Kaihui, WANG Dahui, YANG Pengling, LI Xiangyang. Potential application of HgCdTe detector with composition gradient in laser measurement[J]. Journal of Applied Optics, 2024, 45(3): 549-556. DOI: 10.5768/JAO202445.0310009

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Potential application of HgCdTe detector with composition gradient in laser measurement

1.
Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China
2.
Institute of Northwest Nuclear Technology, Xi'an 710024, China

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Received Date: September 26, 2023
Revised Date: November 13, 2023
Available Online: April 08, 2024

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Abstract

Abstract

The composition gradient was introduced into the structure design of HgCdTe detector, and a method was proposed to reduce the thermally excited carrier concentration near PN junction. The model of dark current mechanism was established, and the analysis of dark current components at high temperature showed that reducing the influence of the thermally excited carrier concentration on the junction was the key to improve the operating temperature of the detector. Different electric fields were built near the PN junction by using the composition gradient. The curves of dark current and noise of the sample with temperature under different electric fields show that the stronger the electric field is, the more obvious the effect of reducing the thermally excited carrier concentration near the junction. Based on the data analysis, it is proposed that the built-in electric field generated by the composition gradient of 10³ V/cm can inhibit the diffusion movement of thermally excited carriers to the junction region, which effectively reduce the concentration of thermally excited carriers near the junction region.

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References

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Potential application of HgCdTe detector with composition gradient in laser measurement