Patent ID: 7579694

Claim:
An electronic device comprising: a first substrate including a metal layer comprising aluminum on the first substrate; a barrier layer on the first substrate offset from the metal layer comprising aluminum; a conductive bump on the barrier layer wherein the barrier layer is between the conductive bump and the first substrate, wherein the conductive bump is offset from the metal layer comprising aluminum, and wherein the barrier layer, the conductive bump, and the metal layer comprising aluminum all comprise different conductive materials; a second substrate bonded to the conductive bump so that the conductive bump is between the first and second substrates; and a wirebond on the metal layer comprising aluminum wherein the metal layer comprising aluminum is free of the conductive material of the barrier layer thereon; wherein the conductive bump comprises at least one of solder, gold, and/or copper, wherein the barrier layer comprises titanium tungsten, and wherein the metal layer comprising aluminum is free of titanium tungsten thereon so that a portion of the first substrate is free of titanium tungsten between the substrate and the wirebond.