Patent ID: 8308053

Claim:
A method for processing a microfeature workpiece using a first metallic constituent and a second metallic constituent, the microfeature workpiece having a first side and a second side opposite the first side, the method comprising: applying a first conductive material to a target location of the microfeature workpiece; applying a second conductive material on the first conductive material, wherein the second conductive material is configured to restrict migration of the first conductive material through the second conductive material; applying a third conductive material on the second conductive material, wherein the third conductive material includes the second metallic constituent; applying a volume of material to the target location of the microfeature workpiece, the volume of material including the first metallic constituent, the first metallic constituent being different than the second metallic constituent; elevating a temperature of the target location and the volume of material to alloy the first metallic constituent with at least a portion of the second metallic constituent, so that the second metallic constituent is distributed generally throughout the volume of material; achieving a target flowability of the volume of material by adjusting a thickness of the third conductive material to vary a quantity of the second metallic constituent available to alloy with the first metallic constituent when the temperature is elevated; planarizing the first side of the microfeature workpiece so the volume of material and the workpiece surrounding the volume of material comprise a generally co-planar surface at the first side; and exposing the volume of material at the second side by removing a portion of the microfeature workpiece from the second side.