Signal, noises, and detectivities in multi-stage infrared photodetectors

Rui Q. Yang

doi:10.1117/12.2647229

15 March 2023 Signal, noises, and detectivities in multi-stage infrared photodetectors

Rui Q. Yang

Proceedings Volume 12430, Quantum Sensing and Nano Electronics and Photonics XIX; 124300E (2023) https://doi.org/10.1117/12.2647229
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

Multi-stage infrared (IR) photodetectors with discrete absorbers can circumvent the diffusion length limitation compared to the conventional detector with a continuous absorber. In this multi-stage detector architecture, the absorber in each stage is designed with a thickness that is thinner than the carrier diffusion length so that photo-generated carriers can be collected efficiently and quickly. Among them, interband cascade IR photodetectors (ICIPs) based on type-II heterostructures with unipolar (electron and hole) barriers are the most promising for high temperature and high-speed operation. In this paper, a comprehensive theory on signal, noises and detectivities in ICIPs will be reviewed and discussed to gain improved understanding of multi-stage IR detectors. Also, a formula is derived to correctly evaluate the detectivity for conventional photodetectors under reverse bias.

Conference Presentation

Citation Download Citation

Rui Q. Yang "Signal, noises, and detectivities in multi-stage infrared photodetectors", Proc. SPIE 12430, Quantum Sensing and Nano Electronics and Photonics XIX, 124300E (15 March 2023); https://doi.org/10.1117/12.2647229

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