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Accession Number ADA564781
Title Self-Organized Quantum Dots for High-Performance Multi-Spectral Infrared Photodetectors.
Publication Date Jun 2010
Media Count 13p
Personal Author A. Madhukar G. J. Brown J. C. Campbell K. Mahlingam Z. Fang
Abstract This AFRL Nanotechnology Initiative program focused on uncovering and overcoming the fundamental limiting factors in realizing high performance self-assembled quantum dot (SAQD) based infrared photodetectors (QDIPs) in the mid-infrared (MIR,3 5 m) and/or long wavelength infrared (LWIR, 8 12 m) regime. This Final Technical Report summarizes the major accomplishments made in this program. The highlights include: (1) successful growth of extended defect-free multiple quantum dot (MQD) structures maintaining high intra- and layer-to- layer uniformity of the SAQDs, (2) analysis of electron occupancy in SAQDs and the potential profile in QDIP structures to guide doping optimization, (3) identification, characterization, and reduction of deep level traps existing in the MBE (molecular beam epitaxy)grown GaAs spacer layers by a factor of 20 and their impact on QDIP electrical characteristics, and (4) the design and implementation of resonant cavity-enhanced QDIP structures for QDIP performance enhancement by a factor of over ten.
Keywords Deep level traps
Electrical properties
Far infrared radiation
Gallium arsenide
Gallium arsenides
Indium arsenide
Infrared detectors
Intermediate infrared radiation
Lattice strain
Long-wavelength infrared
Mid infrared
Molecular beam epitaxy
Mqd(Multiple quantum dot)
Quantum dot infrared photodetectors
Quantum dots
Quantum theory
Resonant cavity
Saqd(Self-assembled quantum dot)
Self organizing systems
Self-assembled quantum dots

Source Agency Non Paid ADAS
NTIS Subject Category 63C - Infrared & Ultraviolet Detection
46 - Physics
95F - Bionics & Artificial Intelligence
Corporate Author University of Southern California, Los Angeles. Dept. of Chemical Engineering.
Document Type Technical report
Title Note Final technical rept. 1 Jul 2006-31 Dec 2998.
NTIS Issue Number 1303
Contract Number FA9550-06-1-0481

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