Three-color quantum dots in a well infrared photodetector

Sanjay Krishna; Sunil Raghavan; Greg von Winckel; Andreas Stintz; Gamini Ariyawansa; Steven Matsik; Unil Perera; Dang Le; David A. Cardimona

doi:10.1117/12.561344

4 November 2004 Three-color quantum dots in a well infrared photodetector

Sanjay Krishna, Sunil Raghavan, Greg von Winckel, Andreas Stintz, Gamini Ariyawansa, Steven Matsik, Unil Perera, Dang Le, David A. Cardimona

Author Affiliations +

Proceedings Volume 5543, Infrared Spaceborne Remote Sensing XII; (2004) https://doi.org/10.1117/12.561344
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

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, Sunil Raghavan, Greg von Winckel, Andreas Stintz, Gamini Ariyawansa, Steven Matsik, Unil Perera, Dang Le, and David A. Cardimona "Three-color quantum dots in a well infrared photodetector", Proc. SPIE 5543, Infrared Spaceborne Remote Sensing XII, (4 November 2004); https://doi.org/10.1117/12.561344

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KEYWORDS

Sensors

Quantum dots

Quantum wells

Infrared radiation

Far infrared

Infrared sensors

Mid-IR

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