Patent ID: 8652865

Claim:
A method of attaching a MEMS to a bonding wafer, comprising: forming an adhesion layer on the MEMS, wherein the adhesion layer comprises a silicon layer and a first silicon germanium layer on the silicon layer; forming a forming a first eutectic layer comprising a second silicon germanium layer on the silicon germanium layer and over the MEMS, wherein the first silicon germanium layer has an average germanium concentration less than an average germanium concentration of the second silicon germanium layer; patterning the first eutectic layer into a checkerboard pattern; forming second eutectic layer comprising aluminum over the bonding wafer wherein the first material and the second material are a eutectic pair; and applying heat and pressure in contacting the first eutectic layer and the second eutectic layer to form a eutectic bond between the MEMS and the bonding wafer.