quantum dot

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quantum dot

[‚kwänt·əm ′dät]
(electronics)
A quantized electronic structure in which electrons are confined with respect to motion in all three dimensions.

quantum dot

(physics)
(Or "single-electron transistor") A location capable of containing a single electrical charge; i.e., a single electron of Coulomb charge. Physically, quantum dots are nanometer-size semiconductor structures in which the presence or absence of a quantum electron can be used to store information.

See also: quantum cell, quantum cell wire, quantum-dot cellular automata.

http://www-mtl.mit.edu/MTL/bulletin/v6n2/Kumar.html.

["Quantum Dot Heterostructures", D. Bimberg, et al, John Wiley & Sons Ltd., Dec 1998].

quantum dot

A minuscule crystal of semiconductor material composed of various compounds of chemicals such as cadmium, zinc, tellurium, selenium and sulfur. Less than 500 nanometers in size, these "nanoparticles" react to light, as well as electricity, and emit their own light across the visible range of wavelengths from 470 to 730 nm.

The applications for quantum dots include medical sensors and lighting systems that are "painted" onto materials. Thin film deposits of quantum dots on solar cell substrates can increase their voltage output by fluorescing the light before it is captured. See QuantumFilm, quantum dot backlight and SUHD.
References in periodicals archive ?
Equation (8) expresses the specimen profile, f(s), in terms of the particle-size distribution and the shape of the nanocrystallites, while (1), after transformation into s-space, expresses the observed profile in terms of f(s).
Ag nanocrystallites displayed an optical absorption band with a peak at 3 keV, which is typical for the absorption of metallic Ag nanocrystallites (copper and carbon peaks existed clue to the grid used for TEM imaging) (30).
There are hundreds of thousands of sheet-like LDH nanocrystallites in each aggregate, as shown in the figure.
Quantum confinement is not limited to nanocrystallites confined to three dimensions (2).
The methods used in making silicon nanocrystallites in nanowires are an important aspect for consideration.
Powdermet has devised a powder metallurgy process allowing the retention of nanocrystallites and ductile reinforcing phases throughout the powder forging or extrusion process, resulting in high strength aluminum materials requiring minimal machining.
Bechstedt, Optical Properties of Ge and Si Nanocrystallites from Ab Initio Calculations.
reported the effect of substrate bias on the structural, nanomechanical, field emission, and ammonia gas sensing properties of nitrogenated amorphous carbon films embedded with nanocrystallites (a-C:N:nc) deposited by a filtered anodic jet carbon arc (FAJCA) technique.
The Ag nanocrystallites display an optical absorption band peaking at 3 keV which is typical of the absorption of metallic silver nanocrystallites (5).