Patent ID: 8603874

Claim:
A method of manufacturing a semiconductor device, the method comprising: forming isolation regions defining a first region and a second region in a semiconductor substrate; injecting a first impurity of a first conductivity type into the first region and the second region; forming a first gate insulating film and a first gate electrode over the first region; forming a second gate insulating film and a second gate electrode over the second region; forming a first mask layer over a first portion of the second region to expose a second portion of the second region and the first region, the first portion provided between the second gate electrode and one of the isolation regions which defines the second region, the second portion provided between the second gate electrode and the other of the isolation regions which defines the second region; and injecting a second impurity of the first conductivity type into the semiconductor substrate from a direction diagonal to the surface of the semiconductor substrate by using the first mask layer, the first gate electrode, and the second gate electrode as masks.