Patent ID: 7618837

Claim:
A method for fabricating a device with integrated circuit in a same substrate and having mechanical structures using post-CMOS process, the method comprising: 1) fabricating circuits on a first region of a substrate; 2) fabricating electrical isolation trenches in the substrate using DRIE, refilling electrical isolation dielectric in the electrical isolation trenches, and backside etching the substrate to expose a bottom of the electrical isolation trenches to electrically isolate the mechanical structures and circuits; 3) fabricating a metal layer over the substrate; 4) fabricating an electrical interconnection such that the mechanical structures are electronically isolated from the circuits; and 5) releasing the mechanical structures using DRIE technology, wherein the circuits are fabricated firstly using standard CMOS technology and without a metal connection, and wherein after the fabrication of the electrical isolation trenches, metal is formed as the electrical interconnection and acts as mask of DRIE.