Patent ID: 7237316
Filing Date: 2007-07-03
Classification: B81B,B81C,G01P,H01S,Y10T

Abstract:
1. A method for fabricating a three-dimensional acceleration sensor, comprising: providing a semiconductor substrate having first and second surfaces; forming an insulating layer on the first surface of the semiconductor substrate; forming an active layer on the insulating layer; selectively removing a portion of the semiconductor substrate so as to define a first boundary of a movable mass; forming a plurality of openings in the active layer at a first region, the first region being located above the movable mass and occupying a predetermined space; selectively removing a portion of the insulating layer located under the first region in a wet-etching process through the plurality of openings so as to define a second boundary of the movable mass; and after said forming a plurality of openings, selectively removing a portion of the active layer to form a groove separating the first region from the movable mass, so as to define a third boundary of the movable mass, wherein the movable mass comprises a remaining portion of the semiconductor substrate, a remaining portion of the insulating layer, and a remaining portion of the active layer.