Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4896271
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Funding
- Walter P. Murphy fellowship
- DARPA
- Army Research Laboratory (ARL)
- Night Vision and Electronic Sensor Directorate (NVESD)
- Air Force Research Laboratory
- NASA
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High performance long-wavelength infrared nBn photodetectors based on InAs/InAs1-xSbx type-II superlattices on GaSb substrate have been demonstrated. The photodetector's 50% cut-off wavelength was similar to 10 mu m at 77 K. The photodetector with a 6 mu m-thick absorption region exhibited a peak responsivity of 4.47 A/W at 7.9 mu m, corresponding to a quantum efficiency of 54% at -90 mV bias voltage under front-side illumination and without any anti-reflection coating. With an R x A of 119 Omega.cm(2) and a dark current density of 4.4 x 10(-4) A/cm(2) under -90mV applied bias at 77 K, the photodetector exhibited a specific detectivity of 2.8 x 10(11) cm. root Hz/W. (C) 2014 AIP Publishing LLC.
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