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http://dx.doi.org/10.5757/JKVS.2008.17.1.009

The protection effects from water vapor permeation of inorganic films prepared by electron-beam evaporation technique  

Ryu, Sung-Won (Department of Electronics Engineering, Catholic University of Daegu)
Rhee, Byung-Roh (Department of Electronics Engineering, Catholic University of Daegu)
Kim, Hwa-Min (Department of Electronics Engineering, Catholic University of Daegu)
Publication Information
Journal of the Korean Vacuum Society / v.17, no.1, 2008 , pp. 9-15 More about this Journal
Abstract
Various diatomic inorganic films and their composite films are packed as passivation films covering Ca cells on glass substrates by using an electron-beam evaporation technique. When these Ca cells are exposed to an ambient atmosphere, the water vapor penetrating through the passivation layers is absorbed in the Ca cells, resulting in a gradual progress of transparency in the Ca cells, which can be represented by changes of the optical transmittance in the visible range. Compared with the saturation times for the Ca cells to become completely transparent in the atmosphere, the protection effects of water vapor are estimated for various passivation films. The composite films consisting silicon oxide($SiO_2$) and tin oxide($SnO_2$) or zinc oxide(ZnO) are found to show a superior protection effect of water vapor as compared with diatomic inorganic films. Also, the main factors affecting the permeation of water vapor through the oxide films are found to be the polarizability and the packing density.
Keywords
WVTR; Inorganic; Passivation; E-beam; Ca test;
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