Electrical property of conductive adhesives during temperature/humidity aging

Effects of carbon black, carbon fiber and silver coated glass fiber on the bulk resistivity of the isotropically conductive adhesives (ICAs) and their contact resistance on Cu and Sn surfaces during the 85 °C/85% RH were investigated. The ICA formulations incorporated with the small amount of the carbon fiber and the silvered fiber showed slightly lower bulk resistivity values than the control formulation, while the ICA formulation with the carbon black showed a significant increase (an order of magnitude) in resistivity. The ICA formulations incorporated with the silvered fiber by 3% and 5% showed relatively stable contact resistance on Sri during aging, although these formulations showed a gradual increase over 20% in contact resistance.