Patent ID: 8741716
Filing Date: 2014-06-03
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising the steps of: forming an isolation layer in a semiconductor substrate to delimit an active region; defining first grooves, which have a bulbous-shaped profile, in gate forming areas of the active region; forming a first insulation layer on surfaces of the first grooves; defining recess parts by etching portions of the first insulation layer which constitute bottoms of the first grooves and portions of the active region which are placed under the bottoms of the first grooves and thereby defining second grooves; etching the isolation layer to expose front and rear surfaces of the gate forming areas in which the recess parts are defined; forming a second insulation layer on surfaces of the recess parts, including the first insulation layer, to form a gate insulation layer comprising the first insulation layer and the second insulation layer; and forming gates in the recess parts, in which the gate insulation layer is formed, on the exposed front and rear surfaces of the gate forming areas.