Patent ID: 6953753
Filing Date: 2005-10-11
Classification: B81B,B81C,G01P,Y10T

Abstract:
1. A method for manufacturing a semiconductor device, in which an active layer is located on a supporting substrate with an insulating intermediate layer therebetween and a movable unit included in the active layer moves in relation to the supporting substrate in response to a force applied to the movable unit, wherein the force is correlated to a dynamic quantity to be measured by the device, the method comprising steps of: forming an SOI substrate that includes a semiconductor substrate, an insulating layer, and a semiconductor layer such that the insulating layer is located between the semiconductor layer and the semiconductor substrate; dry etching the semiconductor layer to form a trench that extends through the semiconductor layer to the insulating layer, wherein the dry etching is performed with a charge prevented from building up on a surface of the insulating layer that is exposed during the dry etching in order to prevent notching; dry etching a sidewall defining the trench at a portion adjacent to a bottom of the trench to form a movable unit, wherein the later dry etching is performed with a charge building up on the surface of the insulating layer such that etching ions is strike to etch the portion of the sidewall.