Characterization of gain and excess noise for mid-wavelength infrared HgCdTe electron avalanche photodiodes

Dan Yang; Huijun Guo; Liao Yang; Lu Chen; Chun Lin; Ruijun Ding; Li He

doi:10.1117/12.2665331

31 January 2023 Characterization of gain and excess noise for mid-wavelength infrared HgCdTe electron avalanche photodiodes

Dan Yang, Huijun Guo, Liao Yang, Lu Chen, Chun Lin, Ruijun Ding, Li He

Author Affiliations +

Proceedings Volume 12505, Earth and Space: From Infrared to Terahertz (ESIT 2022); 125050E (2023) https://doi.org/10.1117/12.2665331
Event: Earth and Space: From Infrared to Terahertz (ESIT 2022), 2022, Nantong, China

Abstract

HgCdTe electron avalanche photodiodes (e-APDs) with single-carrier multiplication hold great promise for weak signal detection. This work investigates the key metrics that affect the signal-to-noise ratio of mid-wavelength infrared (MWIR) Hg0.7Cd0.3Te e-APD: current, gain, and excess noise factor. The gain is over 1000 at -10 V, but the maximum useful gain is limited by the generation of band-to-band tunneling current at higher bias voltages. The gain dispersion obtained by characterizing the focal plane array is 4.7% at -7 V, indicating a relatively homogeneous gain from pixel to pixel. The excess noise factors evaluated by the noise power spectral density and the gain fluctuation methods both range from 1 to 1.32 at gains below 400, demonstrating the property of near excess-noise-free amplification of HgCdTe e-APDs.

Citation Download Citation

Dan Yang, Huijun Guo, Liao Yang, Lu Chen, Chun Lin, Ruijun Ding, and Li He "Characterization of gain and excess noise for mid-wavelength infrared HgCdTe electron avalanche photodiodes", Proc. SPIE 12505, Earth and Space: From Infrared to Terahertz (ESIT 2022), 125050E (31 January 2023); https://doi.org/10.1117/12.2665331

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KEYWORDS

Mercury cadmium telluride

Signal to noise ratio

Staring arrays

Avalanche photodetectors

Mid-IR

Avalanche photodiodes

Ionization

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