Patent ID: 9728521
Date: 2017-08-08
CPC Classifications: H01L

Claim:
1. A method for bonding a pair of semiconductor structures together, the method comprising: providing a pair of semiconductor structures comprising corresponding dielectric layers and corresponding metal features arranged in the dielectric layers, wherein the metal features comprise a copper alloy having copper and a secondary metal, and wherein the metal features comprise a metal feature of the copper alloy; bonding the semiconductor structures together to form a hybrid bond at an interface between the semiconductor structures, the hybrid bond comprising a first bond bonding the dielectric layers together, a second bond bonding the metal features together, and a third bond bonding one of the dielectric layers to the metal feature, and wherein the second bond comprises voids arranged between copper grains of the metal features; and performing an anneal to the hybrid bond to form regions of the secondary metal along boundaries of the copper grains, to fill the voids with the secondary metal, and to fill additional voids of the third bond with the secondary metal.