Patent ID: 7951636

Claim:
A method for fabricating a micro-electro-mechanical system (MEMS) device, comprising: forming a first structural dielectric layer on a substrate; patterning the first structural dielectric layer to have a plurality of indent regions without penetrating through the first structural dielectric layer; forming a conductive diaphragm layer, wherein the conductive diaphragm layer has a corrugated structure corresponding to the indent regions, wherein the step of forming the conductive diaphragm layer comprises: forming a first conductive layer on the first structural dielectric layer; forming an inter-dielectric layer on the first conductive layer; and forming a second conductive layer to cover the inter-dielectric layer, wherein the second conductive layer and the first conductive layer enclose the inter-dielectric layer; forming a second structural dielectric layer on the first structural dielectric layer and the conductive diaphragm layer; forming an etching mask layer on the substrate at a back surface, wherein the etching mask layer has a plurality of openings to expose the substrate, in which the openings are at positions corresponding to venting holes to be formed later; and performing an anisotropic etching process to at least etch the substrate to expose the first structural dielectric layer, wherein the substrate has the venting holes being formed.