Patent ID: 8232183

Claim:
A method of forming an integrated circuit structure, the method comprising: providing an interposer wafer comprising: metal features on a first major surface of the interposer wafer; and copper posts inside the interposer wafer and electrically connected to the metal features; mounting the interposer wafer onto a handling wafer; thinning a second major surface of the interposer wafer opposite the first major surface until the copper posts are exposed; demounting the handling wafer from the interposer wafer after the step of thinning; clipping the interposer wafer onto a fixture, wherein the fixture holds the interposer wafer horizontally and vertically; bonding a die on the interposer wafer, wherein during the step of bonding the die on the interposer wafer, the interposer wafer is clipped on the fixture; and removing the interposer wafer with the die from the fixture.