Patent ID: 7465637
Filing Date: 2008-12-16
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising the steps of: forming a gate trench in a semiconductor substrate; forming a gate insulation film in an inner wall of the gate trench; filling a gate electrode material into at least an inside of the gate trench; selectively forming a punch-through stopper region, using a mask in a prescribed position of the semiconductor substrate that is adjacent to the gate trench; forming a first source/drain region above the punch-through stopper region using the mask used to form the punch-through stopper region; forming a gate electrode by patterning the gate electrode material subsequent to forming the punch-through stopper region and the first source/drain region; and forming a second source/drain region which has different impurity concentration from the first source/drain region on an opposite side from the first source/drain region as viewed from the gate trench subsequent to patterning the gate electrode material.