Pathways for Alkali Ion Transport in Mold Compounds

Abstract

The mobility of potassium ions in a molding compound designed for electronic device insulation has been investigated by a charge attachment induced transport (CAIT) experiment. Two different transport pathways have been identified, i.) through the bulk of the sample and ii.) along boundaries of silica grains embedded in the organic components of the molding compound. The corresponding diffusion coefficients for K+ transport are D-B = 1.8 x 10(-21) cm(2) s(-1) for the bulk and D-GB = 5.4 x 10(-20) cm(2) s(-1) for the grain boundary. The effective activation energy for charge carrier transport amounts to 1.57 eV. (C) 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.