The improvements in the operating temperature and quantum efficiency of quantum-dot infrared photodetectors (QDIPs) have encouraged new imaging techniques that can be used in medical and biological imaging, environmental and chemical monitoring from space. Researchers are developing high-performance imagers using nanotechnology to form quantum dots, which can operate at room temperatures effectively. The QDIP device comprises 25 stacks of a hybrid structure of indium arsenide (InAs) quantum dots and an indium gallium arsenide (InGaAs) quantum well, with aluminum indium arsenide (AlInAs) as a barrier. An atomic-force microscope and a scanning-electron microscope are used to measure the structural properties of the quantum dots, such as size and density, which enhance the capability of QDIPs significantly.
|Original language||English (US)|
|Number of pages||2|
|Specialist publication||Laser Focus World|
|State||Published - Dec 1 2007|
ASJC Scopus subject areas
- Electrical and Electronic Engineering