Patent ID: 8513091

Claim:
A method for wafer bonding, comprising: forming a bond between a first wafer and a second wafer using a first material adjacent the first wafer and a second material adjacent the second wafer, wherein: the first material includes a layer of gold (Au) and a layer of indium (In); the second material includes a layer of Au; and forming the bond between the first wafer and the second wafer includes combining the layer of Au in the first material, the layer of In in the first material, and a portion of the layer of Au in the second material, wherein: combining the layer of Au in the first material, the layer of In in the first material, and the portion of the layer of Au in the second material includes forming gamma phase Au-In; and an additional portion of the layer of Au in the second material is not combined with the layer of Au in the first material and the layer of In in the first material.