Journal
APPLIED PHYSICS LETTERS
Volume 101, Issue 26, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4773373
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Funding
- Department of Science and Technology, Government of India
- MCIT, India, through the Center of Excellence in Nanoelectronics
- U.S. National Science Foundation [ECCS-1232184]
- Georgia State University, Atlanta, Georgia, USA
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1232184] Funding Source: National Science Foundation
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An InAs/GaAs quantum dot infrared photodetector with strong, multicolor, broadband (5-20 mu m) photoresponse is reported. Using a combined quaternary In0.21Al0.21Ga0.58As and GaAs capping that relieves strain and maintains strong carrier confinement, we demonstrate a four color infrared response with peaks in the midwave-(5.7 mu m), longwave-(9.0 and 14.5 mu m), and far-(17 mu m) infrared regions. Narrow spectral widths (7% to 9%) are noted at each of these wavelengths including responsivity value similar to 95.3mA/W at 14.5 mu m. Using strain field and multi-band k.p theory, we map specific bound-to-bound and bound-to-quasibound transitions to the longwave and midwave responses, respectively. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4773373]
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