4 November 2004 Three-color quantum dots in a well infrared photodetector
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A three color normal incidence quantum dots in a well (DWELL) operating in the mid-wave infrared (MWIR), long wave infrared (LWIR) and very long wave infrared (VLWIR) are reported. The peak operating wavelengths are at ~ 6 mm, ~10.5 mm and ~ 23.2 mm. We believe that the shorter wavelength response (6 mm and 10.5 mm) are due to bound-to-continuum and bound-to-bound transitions between the states in the dot and states in the well, whereas the longer wavelength response (23.2 mm) is due to intersubband transition between dot levels. A bias dependent activation energy ~ 100 meV was extracted from the Arrhenious plots of the dark currents, which is a factor of three larger than that observed in quantum well infrared photodetectors operating at comparable wavelengths.
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Sanjay Krishna, Sanjay Krishna, Sunil Raghavan, Sunil Raghavan, Greg von Winckel, Greg von Winckel, Andreas Stintz, Andreas Stintz, Gamini Ariyawansa, Gamini Ariyawansa, Steven Matsik, Steven Matsik, Unil Perera, Unil Perera, Dang Le, Dang Le, David A. Cardimona, David A. Cardimona, "Three-color quantum dots in a well infrared photodetector", Proc. SPIE 5543, Infrared Spaceborne Remote Sensing XII, (4 November 2004); doi: 10.1117/12.561344; https://doi.org/10.1117/12.561344


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