Recent developments in interband cascade infrared photodetectors

Hossein Lotfi; Lu Li; Lin Lei; Hao Ye; SM Shazzad Rassel; Yuchao Jiang; Rui Q. Yang; John F. Klem; Tetsuya D. Mishima; Michael B. Santos; Matthew B. Johnson; James A. Gupta

doi:10.1117/12.2235086

20 May 2016 Recent developments in interband cascade infrared photodetectors

Hossein Lotfi, Lu Li, Lin Lei, Hao Ye, SM Shazzad Rassel, Yuchao Jiang, Rui Q. Yang, John F. Klem, Tetsuya D. Mishima, Michael B. Santos, Matthew B. Johnson, James A. Gupta

Author Affiliations +

Proceedings Volume 9819, Infrared Technology and Applications XLII; 98190Q (2016) https://doi.org/10.1117/12.2235086
Event: SPIE Defense + Security, 2016, Baltimore, MD, United States

Abstract

We investigate high-temperature and high-frequency operation of interband cascade infrared photodetectors (ICIPs)-two critical properties. Short-wavelength ICIPs with a cutoff wavelength of 2.9 μm had Johnson-noise limited detectivity of 5.8×10⁹ cmHz^1/2/W at 300 K, comparable to the commercial Hg_1-xCd_xTe photodetectors of similar wavelengths. A simple but effective method to estimate the minority carrier diffusion length in short-wavelength ICIPs is introduced. Using this approach, the diffusion length was estimated to be significantly shorter than 1 μm at high temperatures, indicating the importance of a multiple-stage photodetector (e.g., ICIPs) at high temperatures. Recent investigations on the high-frequency operation of mid-wavelength ICIPs (λc=4.3 μm) are discussed. These photodetectors had 3-dB bandwidths up to 1.3 GHz with detectivities exceeding 1x10⁹ cmHz^1/2/W at room temperature. These results validate the ability of ICIPs to achieve high bandwidths with large sensitivity and demonstrate the great potential for applications such as: heterodyne detection, and free-space optical communication.

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Hossein Lotfi, Lu Li, Lin Lei, Hao Ye, SM Shazzad Rassel, Yuchao Jiang, Rui Q. Yang, John F. Klem, Tetsuya D. Mishima, Michael B. Santos, Matthew B. Johnson, and James A. Gupta "Recent developments in interband cascade infrared photodetectors", Proc. SPIE 9819, Infrared Technology and Applications XLII, 98190Q (20 May 2016); https://doi.org/10.1117/12.2235086

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