A method has been developed for inserting submonolayer (SML) quantum dots (QDs) or SML QD stacks, instead of conventional Stranski-Krastanov (S-K) QDs, into the active region of intersubband photodetectors. A typical configuration would be InAs SML QDs embedded in thin layers of GaAs, surrounded by AlGaAs barriers. Here, the GaAs and the AlGaAs have nearly the same lattice constant, while InAs has a larger lattice constant.
This work was done by David Z. Ting, Sumith V. Bandara, and Sarath D. Gunapala of Caltech and Yia-Chung Chang of the University of Illinois for NASA’s Jet Propulsion Laboratory. For more information, download the Technical Support Package (free white paper) at www.techbriefs.com/tsp under the Physical Sciences category. NPO-46115
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Submonolayer Quantum Dot Infrared Photodetector (reference NPO-46115) is currently available for download from the TSP library.
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