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Note: Inhibiting bottleneck corrosion in electrical calcium tests for ultra-barrier measurements
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A major failure mechanism is identified in electrical calciumcorrosion tests for quality assessment of high-end application moisture barriers. Accelerated calciumcorrosion is found at the calcium/electrode junction, leading to an electrical bottleneck. This causes test failure not related to overall calcium loss. The likely cause is a difference in electrochemical potential between the aluminumelectrodes and the calcium sensor, resulting in a corrosion element. As a solution, a thin, full-area copper layer is introduced below the calcium, shifting the corrosion element to the calcium/copper junction and inhibiting bottleneck degradation. Using the copper layer improves the level of sensitivity for the water vapor transmission rate (WVTR) by over one order of magnitude. Thin-film encapsulated samples with 20 nm of atomic layer deposited alumina barriers this way exhibit WVTRs of 6 × 10−5 g(H2O)/m2/d at 38 °C, 90% relative humidity.
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