Patent ID: 8528802
Filing Date: 2013-09-10
Classification: B23K,H01L,Y10T

Abstract:
1. An apparatus comprising: a bond head to hold a first substrate, a first set of metal pads projecting from a surface of the first substrate, the first substrate comprising a first integrated circuit die; a supplemental support to hold a second substrate, a second set of metal pads projecting from a surface of the second substrate, the second substrate comprising a second integrated circuit die; an aligner to laterally align the first set of metal pads to the second set of metal pads, thereby forming an aligned set of metal pads; a leveler to vertically level the first substrate relative to the second substrate, thereby adjusting to reduce a tilt across facing surfaces of the first substrate and the second substrate, the bond head coupled directly to the leveler; a support holding the leveler and the bond head such that the leveler is disposed between the bond head and the support; a reduction module containing the aligned set of metal pads, and wherein the reduction module comprises a plurality of gas inlets coupled to a reduction gas source, the reduction gas source holding a reduction gas, the reduction gas being a gas suitable to remove metal oxide formed on the first set and the second set of metal pads to allow direct metal to metal inter diffusion; and a transducer to provide a repeated relative motion to the aligned set of metal pads while the first substrate and the second substrate are within about 5 μm of each other and after the first substrate is leveled by the leveler relative to the second substrate.