Method for bonding IC chips to substrates with non-conductive adhesive

Abstract

A method for bonding an IC chip by a non-conductive adhesive that contains between about 5 weight % and about 25 weight % of a non-conductive filler is described. The filler particles in the filler material must have a hardness that is higher, and preferably at least two times higher, than the metal material forming the bump. Moreover, the filler particles must be non-electrically conductive such that electrical shorts between a plurality of bumps on the IC chip do not occur. The concentration of the filler in the adhesive must be high enough so as to reduce the CTE of the adhesive to match that of the IC chip and the substrate, and low enough so as not to impede the electrical communication between the bumps on the IC chip and the bond pads on the substrate.

Dependencies are inferred from the claim text.