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.
References in periodicals archive ?
997 Percent Pure Or Total Impurity Level Lessthan 30 Ppm.
The '727 patent claims pharmaceutical batches of a drug product comprising bivalirudin, wherein the batches have a maximum impurity level of Asp9-bivalirudin that does not exceed about 0.
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 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.
The oxidation was independent of the V/III ratio of the growth, impurity level in the initial epilayer, and specimen edge preparation, whether wet etched, ion milled, chemically-assisted ion-beam etched, or cleaved.
He concluded that "with Hmode confinement and low impurities, Ignitor could reach ignition; with H-mode confinement and moderate light impurity level, FIRE could achieve Q greater than 5; with H-mode confinement and moderately-low Beryllium concentration, ITER could reach ignition.
The process consistently produces acids with a maximum impurity level of 500 parts-per-trillion for most metals.