20 May 2016 Recent developments in interband cascade infrared photodetectors
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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 cmHz1/2/W at 300 K, comparable to the commercial Hg1-xCdxTe 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 cmHz1/2/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, Hossein Lotfi, Lu Li, Lu Li, Lin Lei, Lin Lei, Hao Ye, Hao Ye, SM Shazzad Rassel, SM Shazzad Rassel, Yuchao Jiang, Yuchao Jiang, Rui Q. Yang, Rui Q. Yang, John F. Klem, John F. Klem, Tetsuya D. Mishima, Tetsuya D. Mishima, Michael B. Santos, Michael B. Santos, Matthew B. Johnson, Matthew B. Johnson, James A. Gupta, James A. Gupta, } "Recent developments in interband cascade infrared photodetectors", Proc. SPIE 9819, Infrared Technology and Applications XLII, 98190Q (20 May 2016); doi: 10.1117/12.2235086; https://doi.org/10.1117/12.2235086
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