passivation

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passivation

[‚pas·ə′vā·shən]
(electronics)
Growth of an oxide layer on the surface of a semiconductor to provide electrical stability by isolating the transistor surface from electrical and chemical conditions in the environment; this reduces reverse-current leakage, increases breakdown voltage, and raises power dissipation rating.
(metallurgy)
To render passive; to reduce the reactivity of a chemically active metal surface by electrochemical polarization or by immersion in a passivating solution.

passivation

Treatment of a metal surface which leaves a protective coating, rendering the surface less reactive chemically.
References in periodicals archive ?
In the present paper, Fe-Cr alloys with Cr contents of 8, 10, and 12% were processed by ECAP, and their corrosion resistance was evaluated by anodic polarization measurements to determine the stability of the passivation layer. The purposes of the present study were as follows:
Figure 1 is the schematic of major reactions involved in lithium plating process: 1) The main reaction of lithium insertion in layered structure of carbon (assuming graphite anode); 2) the plating reaction; 3) plated lithium are oxidized by electrolyte to form passivation layers like SEI; 4) plated lithium accumulates to form dendrites.
The passivation layer was locally opened on top of the sensor electrodes, allowing [Ta.sub.2][O.sub.5] to be deposited by CVD, yielding a device that was stable at least for several days.
The flat silicon structure covered by Si[O.sub.2] passivation layer and hemisphere Ag back reflect reflection is also included for comparison which has much lower absorption in whole wavelength.
At first, we found that in parts produced from an older solution, the passivation layer has cracks which are not seen in parts from a fresh/new solution.
West Chester, PA, April 21, 2016 --(PR.com)-- Sklar Instruments announced today that Sklar is now an approved supplier of Censis Technologies' CensiMark, the industry's only proprietary mark that does not disturb the passivation layer of standard or specialty instruments.
In order to tackle the problem, the team used a protective film that consisted of silicon oxynitride and parlene (called passivation layer) to protect the display from oxygen and water vapor.
Times of up to two hours at temperatures of 70[degrees]C with a concentration of 20% to 50% nitric acid result in a more robust passivation layer. Autoclaving is both chemically and thermally aggressive to an oxide layer.
In one spot (arrow) the cracking can be seen to extend outward under the passivation layer. The traces on the die are very faintly visible as pale features in this gate.
An L-BSF PV cell has an insultion or passivation layer on its back.
Refining this surface with Scotch-Brite Metal Finishing Products, creates a smooth surface which potentially reinstalls the passivation layer.