Latch-up effect of HgCdTe detector irradiated by pulsed laser

Shuai Qiao; Rui Wang; Xiaocheng Hou

doi:10.1117/12.2648364

14 October 2022 Latch-up effect of HgCdTe detector irradiated by pulsed laser

Shuai Qiao, Rui Wang, Xiaocheng Hou

Proceedings Volume 12343, 2nd International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2022); 123430Z (2022) https://doi.org/10.1117/12.2648364
Event: 2nd International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2022), 2022, Qingdao, China

Abstract

A new phenomenon was discovered in the experiment of the HgCdTe detector irradiated by the laser, namely the photoinduced latch-up effect. Based on this phenomenon, a two-dimensional simulation model of laser irradiation on the detector chip was established by using COMSOL Multiphysics simulation software. The carrier concentration distribution, photo-induced current, and temperature in the photosensitive chip were simulated after being irradiated by a single-pulse laser with different power to explore the principle of the latch-up effect triggered by the laser. The research shows that there is a PNPN structure in the photosensitive chip, with parasitic bipolar transistors PNP and NPN. Both parasitic transistors are turned off if the photosensitive chip is working normally. A large number of photo-generated carriers are generated when the photosensitive chip is irradiated by a high-power pulse laser, and the two parasitic transistors are triggered to conduct and form a positive feedback loop, resulting in a large current and triggering the latch-up.

Citation Download Citation

Shuai Qiao, Rui Wang, and Xiaocheng Hou "Latch-up effect of HgCdTe detector irradiated by pulsed laser", Proc. SPIE 12343, 2nd International Conference on Laser, Optics and Optoelectronic Technology (LOPET 2022), 123430Z (14 October 2022); https://doi.org/10.1117/12.2648364

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KEYWORDS

Sensors

Mercury cadmium telluride

Optical simulations

Pulsed laser operation

Laser irradiation

Transistors

Infrared radiation

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