Patent ID: 7243833
Filing Date: 2007-07-17
Classification: B23K,H01L

Abstract:
1. A method of forming a MEMS device assembly, comprising: forming an active MEMS region on a substrate; forming a plurality of bonding pads electrically coupled to the active MEMS region forming a seal ring wetting layer on the substrate, the seal ring wetting layer surrounding the active MEMS region; positioning a single piece solder preform on the bonding pads and seal ring wetting layer, the single piece solder preform including a seal ring region and a bonding pad region, the seal ring region being connected to the bonding pad region by a plurality of solder bridges; heating the single piece solder preform to a temperature of at least the solder reflow temperature, so that the bridges split and the solder from the preform accumulates on the seal ring wetting layer and the bonding pads; cooling the solder after the heating the single piece solder perform to a temperature of at least the solder reflow temperature, wherein the solder forms a solder seal ring on the seal ring wetting layer and solder bonding pad interconnects on the bonding pads; and forming a wetting layer on a portion of a lid and coupling the lid to the solder, wherein the coupling the lid to the solder includes positioning the lid so that the wetting layer on the lid is positioned on the solder seal ring and on the solder bonding pad interconnects, and wherein the wetting layer on a portion of the lid is formed from the same material as the seal ring wetting layer and the bonding pads.