Patent ID: 8173508

Claim:
A method of manufacturing a semiconductor device, comprising: forming a semiconductor layer having a plurality of stripe-like trenches; forming a gate electrode buried partially in each of the plurality of trenches; and introducing an impurity into the semiconductor layer by ion implantation after forming the gate electrode, wherein the gate electrode comprises: a buried portion formed in each of the trenches; and a protruding portion that is formed on the buried portion and has a width greater than a width of the buried portion, wherein the introducing the impurity includes introducing the impurity into the semiconductor layer below the protruding portion by oblique ion implantation, and wherein the protruding portion comprises a first protruding portion and a second protruding portion adjacent to the first protruding portion, and the introducing of the impurity comprises implanting the impurity under the first protruding portion at a first incident angle and implanting the impurity under the second protruding portion at the first incident angle.