Patent ID: 8227264

Claim:
A method of fabricating an electronic device assembly, the method comprising: coupling an interposer to a substrate, the substrate comprising a first material having a first thermal expansivity, and the interposer comprising a second material having a second thermal expansivity, wherein the second thermal expansivity is different from the first thermal expansivity, and there is a coefficient of thermal expansion mismatch between the first material of the substrate and the second material of the interposer, and wherein the coupling comprises providing a first plurality of electrical contacts and an adhesive material at least partially surrounding the first plurality of electrical contacts to couple the interposer to the substrate, the adhesive material bonding the interposer to the substrate and reducing strain on the first plurality of electrical contacts resulting from the coefficient of thermal expansion mismatch between the second material of the interposer and the first material of the substrate; coupling an integrated circuit chip to the interposer using a second plurality of electrical contacts, wherein the integrated circuit chip is coupled to the interposer without use of an adhesive material at least partially surrounding the second plurality of electrical contacts, and wherein the integrated circuit chip comprises the second material having the second thermal expansivity, and the second plurality of electrical contacts have a lower reworking temperature than the first plurality of electrical contacts, and wherein the second plurality of electrical contacts coupling the integrated circuit chip to the interposer without use of adhesive facilitates reworking of the electronic device assembly by facilitating removal of the integrated circuit chip from the interposer at the lower reworking temperature of the second plurality of electrical contacts.