Patent ID: 8975090
Filing Date: 2015-03-10
Classification: B81B,B81C,G01C,G01P,H01L

Abstract:
1. A method for manufacturing a MEMS sensor comprising the steps of: forming a recess dug to a halfway point in the thickness direction of a semiconductor substrate by selectively etching the surface layer portion of a sensor region of the semiconductor substrate having the sensor region and a peripheral region surrounding the sensor region, and concurrently, forming a comb-tooth-like fixed electrode and movable electrode that engage with each other via the recess; forming a sacrifice layer that covers the sensor region and exposes the peripheral region; forming a protective layer made of a first inorganic material on the semiconductor substrate so that a peripheral edge portion of the protective layer is bonded to the peripheral region and the central portion surrounded by the peripheral edge portion covers the sacrifice layer; forming a space between the protective layer and the sensor region by removing the sacrifice layer directly below the protective layer; and forming a cavity by linking the lower portions of the fixed electrode and the movable electrode to each other by isotropic etching by supplying an etching medium into the recess after removing the sacrifice layer.