Monte Carlo Simulation of High-Speed MWIR HgCdTe e-APD

High-speed avalanche photodiodes (APDs) have attracted great interest for their potential applications in weak signal detection and free-space communication. In this article, the bandwidth characteristics of mid-wavelength infrared (MWIR) Hg 0.7 Cd 0.3 Te electron-APDs (e-APDs) are investigated by t...

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Bibliographic Details
Published in:IEEE transactions on electron devices 2022-07, Vol.69 (7), p.3753-3760
Main Authors: Zhou, Zhiqi, Zhu, Liqi, Xie, Zhiyang, Chen, Baile
Format: Article
Language:English
Subjects:
Absorption
Avalanche diodes
Avalanche photodiodes (APDs)
Bandwidth
Bandwidths
Charge carrier processes
HgCdTe
High speed
Impact ionization
Mercury (metals)
mid-wavelength infrared (MWIR)
Monte Carlo
Monte Carlo methods
Monte Carlo simulation
Photodiodes
Scattering
Signal detection
Space communication
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Summary:High-speed avalanche photodiodes (APDs) have attracted great interest for their potential applications in weak signal detection and free-space communication. In this article, the bandwidth characteristics of mid-wavelength infrared (MWIR) Hg 0.7 Cd 0.3 Te electron-APDs (e-APDs) are investigated by the Monte Carlo method. The simulated gain, excess noise, and carrier velocity agree well with the previously reported experimental data. Moreover, the transport process of photogenerated carriers is described in detail. Meanwhile, the effects of different absorption region thickness as well as the incident wavelengths on the device bandwidth are studied, and the trend of the bandwidth with bias voltage is explained. Finally, a structure with gradient {p} -region is proposed to further increase the bandwidth.
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2022.3177159