Patent ID: 7981765
Filing Date: 2011-07-19
Classification: B81C,H01L

Abstract:
1. A method of bonding a MEMS wafer to a second wafer, the method comprising: providing the MEMS wafer with a two-dimensional array of MEMS devices; providing the second wafer; depositing a metal alloy onto one or both the MEMS wafer and the second wafer, the metal alloy comprising a rare earth metal; aligning the MEMS wafer and the second wafer; forming an intermediate apparatus having the metal alloy between the MEMS wafer and the second wafer; heating the intermediate apparatus at least to within 75 degrees C. of the melting point of the metal alloy between the MEMS wafer and the second wafer; and cooling the wafers to form a plurality of conductive hermetic sealing rings about the plurality of the MEMS devices on the MEMS wafer, the sealing rings bonding the MEMS wafer to the second wafer.