Patent ID: 8927311
Filing Date: 2015-01-06
Classification: B81B,G01P,H01L,Y10T

Abstract:
1. A method for producing a microelectromechanical systems (MEMS) device comprising: providing a substrate; forming a first dielectric layer overlying said substrate; forming a first structural layer overlying said first dielectric layer, wherein said forming said first structural layer comprises producing a sense plate in said first structural layer; forming a second dielectric layer over said first structural layer to produce a base structure in which a portion of said first dielectric layer is exposed from both of said first structural layer and said second dielectric layer, wherein said sense plate is laterally displaced away from said portion of said first dielectric layer in said base structure, and said sense plate includes openings extending through said sense plate to expose a second portion of said first dielectric layer; forming a sacrificial layer overlying said portion of said first dielectric layer and said second dielectric layer of said base structure; forming a second structural layer overlying said sacrificial layer, wherein said forming said second structural layer comprises forming a proof mass in said second structural layer; and selectively removing said sacrificial layer and said portion of said first dielectric layer to expose a top surface of said substrate underlying said portion of said first dielectric layer and to release said proof mass such that said proof mass is movable relative to said base structure, wherein said selectively removing operation further comprises removing said second portion of said first dielectric layer underlying said sense plate via said openings.