Abstract
The traditional method to determine moisture absorption relies on a weight gain measurement metrology with an analytical balance. This approach is generally not suitable for thin samples. In this study, the moisture absorption–desorption behavior of a thin BT core was characterized in situ using a sorption TGA over a temperature range of 30–80°C, in an environment of up to 80% relative humidity. From the experimental results, the moisture diffusivity and the saturated moisture content have been determined. Within the experimental temperature range, the diffusivity can be described by the Arrhenius equation and the activation energy can be calculated. The results obtained are compared with literature data. The impact of moisture diffusion in BT core on the reliability of ultrathin stacked chip scale packages (UT SCSP) was discussed.
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