24 September 2013 Radiation tolerance of type-II strained layer superlattice-based interband cascade infrared photodetectors (ICIP)
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Abstract
For space-based imaging systems radiation tolerance to both displacement damage and total ionizing dose (TID) radiation effects continues to be a major performance concern. Here, the TID and proton irradiance tolerance of mid wave infrared interband cascade infrared photodetectors (ICIPs) based on InAs/GaSb type II strained-layer superlattice (T2SLS) absorbers is presented. Protons of energy of 63 MeV were used to irradiate the unbiased ICIP detectors at room temperature to a proton fluence of 7.5 x 1011 protons/cm2, corresponding to a TID of 100 kRads(Si). A comparison of the detector performance of a variety of ICIPs with different numbers of electron barrier sizes cascade stages is presented. Performance of detectors of varying size was characterized by dark current and quantum efficiency measurements at different temperatures. Results show changes, increase in dark current and a reduction in the quantum efficiency, consistent with an increase in the trap density.
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Vincent M. Cowan, Vincent M. Cowan, Laura A. Treider, Laura A. Treider, Christian P. Morath, Christian P. Morath, Zhaobing Tian, Zhaobing Tian, Nutan Gautam, Nutan Gautam, Sanjay Krishna, Sanjay Krishna, } "Radiation tolerance of type-II strained layer superlattice-based interband cascade infrared photodetectors (ICIP)", Proc. SPIE 8876, Nanophotonics and Macrophotonics for Space Environments VII, 88760A (24 September 2013); doi: 10.1117/12.2022529; https://doi.org/10.1117/12.2022529
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