Patent ID: 7214625
Filing Date: 2007-05-08
Classification: B81C

Abstract:
1. A method for manufacturing a semiconductor device having a movable portion, the method comprising the steps of: forming a trench on a semiconductor layer so that the trench reaches an insulation layer disposed under the semiconductor layer; and forming the movable portion by etching a sidewall of the trench disposed near the bottom of the trench in a direction parallel to the insulation layer so that the semiconductor layer is separated from the insulation layer, wherein the steps of forming the trench and forming the movable portion are performed by a reactive ion etching method, wherein the insulation layer disposed on the bottom of the trench is prevented from charging positively in the step of forming the trench, and wherein the insulation layer disposed on the bottom of the trench is charged positively in the step of forming the movable portion.