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Evaluation of the sensitivity limits of water vapor transmission rate measurements using electrical calcium test

机译：使用电钙测试评估水蒸气透过率测量的灵敏度极限

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摘要

The development of flexible organic light emitting diode displays and flexible thin film photovoltaic devices is dependent on the use of flexible, low-cost, optically transparent and durable barriers to moisture and/or oxygen. It is estimated that this will require high barriers with water vapor transmission rates (WVTR) between 10-4 and 10-6 g/m2/day. Thus, there is a need to develop a relatively fast, low cost, and quantitative method to evaluate such low permeation rates. Prior works have demonstrated that Ca films, because they change optically and electrically upon reaction with moisture, can be used as a sensor, enabling one to calculate a WVTR between 10 and 10-6 g/m2/day or better. In this work, we analyze the accuracy of an electrical Ca test method. We focus on the effects of the addition of a diffusion spacer and the effects of interactions of edge-seal material with changes to the spacer contacting surface on the overall accuracy. Furthermore, we examine a series of factors that can lead to different errors resulting in qualitative rather than quantitative Ca test behavior. We demonstrate that accurate, relatively high throughput, and reproducible measurements are possible for very low WVTR films in the 10-6 g/m2/day range.
机译：柔性有机发光二极管显示器和柔性薄膜光伏器件的开发取决于对水分和/或氧气的柔性，低成本，光学透明和耐用的屏障的使用。据估计，这将需要较高的屏障，使水蒸气透过率（WVTR）在10 -4 和10 -6 g / m 2 之间/天。因此，需要开发一种相对快速，低成本和定量的方法来评估这种低渗透率。先前的工作表明，Ca膜由于与水分反应会发生光学和电学变化，因此可以用作传感器，从而使人们能够计算出10至10 -6 g / m 2 /天或更好。在这项工作中，我们分析了电Ca测试方法的准确性。我们专注于添加扩散垫片的影响以及边缘密封材料与垫片接触表面的变化对整体精度的影响。此外，我们检查了一系列因素，这些因素可能导致不同的错误，从而导致定性而不是定量的Ca测试行为。我们证明，对于10 -6 g / m 2 /天范围内的非常低的WVTR胶片，可以进行准确，相对较高的通量和可重复的测量。

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