Patent ID: 8093119

Claim:
A method for fabricating a microelectromechanical system (MEMS) device, comprising: providing a substrate, having a first side and a second side, wherein a metal silicide is formed on the substrate at the first side, covering a MEMS region of the substrate; forming a structural dielectric layer over the substrate at a first side, wherein a diaphragm is embedded in the structural dielectric layer; patterning the substrate from the second side to form a plurality of perforating openings in the substrate corresponding to the diaphragm, wherein the metal silicide is exposed by the perforating openings in the substrate; and performing an isotropic etching process from the first side and the second side of the substrate via the perforating openings to remove a dielectric portion of the structural dielectric layer for exposing a central portion of the diaphragm while an end of portion is held by a residue portion of the structural dielectric layer.