Research on high gain-bandwidth product mid-wavelength infrared HgCdTe avalanche photodiodes

Hao Xie; Huijun Guo; Liqi Zhu; Liao Yang; Chuan Shen; Baile Chen; Lu Chen; Li He

doi:10.1117/12.2665553

31 January 2023 Research on high gain-bandwidth product mid-wavelength infrared HgCdTe avalanche photodiodes

Hao Xie, Huijun Guo, Liqi Zhu, Liao Yang, Chuan Shen, Baile Chen, Lu Chen, Li He

Proceedings Volume 12505, Earth and Space: From Infrared to Terahertz (ESIT 2022); 125050R (2023) https://doi.org/10.1117/12.2665553
Event: Earth and Space: From Infrared to Terahertz (ESIT 2022), 2022, Nantong, China

Abstract

HgCdTe avalanche photodiodes (APD) have been demonstrated to be one of the most promising paths for low flux and high speed applications. The bandwidth of HgCdTe e-APD has been theoretically predicted to be independent of the gain, owed to its strongly dominant electron multiplication. However, when the photocurrent is high, a large number of electrons exists in the depletion region, and the electrical field in the depletion region might collapse due to the space charge effect, thus limiting the increase of the gain-bandwidth product. In this work, the structure of the device was optimized by simulation, and the effect of the light injection dose on the electric field and bandwidth of the device was studied. Finally, a mid-wavelength infrared HgCdTe e-APD device whose bandwidth almost doesn't decrease with the increase of gain is fabricated. The response bandwidth of the APD is about 480MHz @ gain=625, corresponding to a gain-bandwidth product of 300GHz.

Citation Download Citation

Hao Xie, Huijun Guo, Liqi Zhu, Liao Yang, Chuan Shen, Baile Chen, Lu Chen, and Li He "Research on high gain-bandwidth product mid-wavelength infrared HgCdTe avalanche photodiodes", Proc. SPIE 12505, Earth and Space: From Infrared to Terahertz (ESIT 2022), 125050R (31 January 2023); https://doi.org/10.1117/12.2665553

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