Patent ID: 9302907
Filing Date: 2016-04-05
CPC Classification: B81C,H01L

Claim Text:
1. A method for making a MEMS device with guard ring, comprising: providing a substrate including transistor devices, part of interconnection and MEMS structure; forming a top dielectric layer; forming a top metal layer, part of which forms a bond pad; and forming a sidewall on, surrounding and connected with the bond pad, the sidewall being disposed on and along all sides of the bond pad to extend upward from the bond pad in a direction opposing to a downward direction from the bond pad toward the substrate, to form a guard ring extending upward from the bond pad, wherein the sidewall is made of metal or amorphous silicon resistive to an etchant capable of etching the top dielectric layer, wherein the sidewall forms a guard ring; and after forming the sidewall, etching part of the top dielectric layer to release the MEMS device.