26 January 2018 Gain and resonant tunneling in interband cascade IR photodetectors
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Abstract
Interband cascade IR photodetectors (ICIPs) are multi-stage detectors with discrete absorbers separated by unipolar electron and hole barriers. 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. This advantage has been validated with the operation of ICIPs at high temperatures (>400 K) and high frequencies (up to 1.3 GHz). Recently, electrical gain exceeding unity was observed in ICIPs. Also, negative differential conductance (NDC) was observed at high temperatures. In this paper, we will discuss the underlying physics of the NDC and a new mechanism that should well explain the electrical gain in ICIPs, as well as our progress towards improved understanding and high temperature performance.
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Rui Q. Yang, Wenxiang Huang, Lu Li, Lin Lei, Jeremy A. Massengalea, Tetsuya D. Mishima, Michael B. Santos, "Gain and resonant tunneling in interband cascade IR photodetectors ", Proc. SPIE 10540, Quantum Sensing and Nano Electronics and Photonics XV, 105400E (26 January 2018); doi: 10.1117/12.2289121; https://doi.org/10.1117/12.2289121
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