impurity level

impurity level

[im′pyu̇r·əd·ē ‚lev·əl]
(solid-state physics)
An energy level in the band gap of a semiconductor that results from the presence of an impurity atom.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
As micronized salt has a purity level of about 98%, the manufacturers of the industry are rapidly replacing the traditional solar salt with micronized salt, in order to curtail the impurity level and have high efficiency for numerous food & beverage applications.
In AFORS-HET, the doping concentration can be both boron and phosphorus, and the impurity level can be easily adjusted, which is suitable for compensated HIT solar cell research.
While the long absorption tail in [(NS).sub.x]-[T.sub.FA] and in [(NS).sub.x]-[T.sub.AA] samples is attributed to both, institutional doping of nitrogen atoms into the Ti[O.sub.2] lattice results in forming an isolated N impurity level above the valence band and mixing of S states with the conduction band (Ti3d).
However, in III-V bismide alloys, the band gap reduction occurs due to a restructuring of the valence band as a result of the interaction of the Bi impurity level with the same band [6].
When high concentration of initiator is applied, the respective impurity level is higher and the purification time should be elapsed.
The foundation began the project from Giddarbaha village as they found water impurity level high in the water.
Ultrapure means that the impurity level is less than 1 ppm.
* the filtering element can not be visualized and it has to be dismantled for the impurity level to be checked;
For high impurity concentration, when the impurity level merges with the conduction or valence band, the free electron (hole)-phonon scattering theory explains the conductivity values of a number of doped semiconductors.
The first linear model is valid for a low" impurity level and the resulting control algorithm works well in this region, but exhibits unacceptable oscillatory behavior for medium and big setpoint changes, is shown in Fig.
One reason for this is that the solder supplier will not be held responsible for any claim if solder is used with a higher contamination level than what they advise as maximum impurity level. The second reason is that they live by selling solder, so it is also partly in their interest if the solder has to be exchanged.
The high correlation between color and color at 1% impurity, without any correlation of note observed between color and impurities, is indicative of the predominant effects of genetic variation in color, rather than variation in impurity level, in driving variation in color-impurity levels.