Patent ID: 7964464
Filing Date: 2011-06-21
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising: forming, in a semiconductor substrate between a first region and a second region, a device isolation film; forming, above the semiconductor substrate in the first region, a gate insulating film and a gate electrode; forming, above the semiconductor substrate and the gate electrode, a first photoresist film covering the second region and having an opening exposing the first region and having an edge at a position nearer the second region than a middle of the device isolation film; and implanting impurity ions from a direction tilted from a normal direction of the semiconductor substrate with the first photoresist film and the gate electrode as a mask to form a pair of pocket regions in the semiconductor substrate in areas both sides of the gate electrode, wherein for the edge of the opening parallel to an extending direction of the gate electrode, the opening of the first photoresist film is formed so that, when wherein a distance from an end of the gate electrode to the middle of the device isolation film is L; a film thickness of the first photoresist film is h; a tilt angle of an ion implantation to the normal direction of the semiconductor substrate is θ; a twist angle of the ion implantation to the extending direction of the gate electrode is Φ; and a minimum width, of a width from the end of the gate electrode of a region into which the ion implantation is made without an influence of a shadowing of the first photoresist film, which produces a threshold voltage roll-off characteristic of a MISFET equivalent to those produced by ion implantation for forming the pocket regions without forming the first photoresist film is d 1 , is given, wherein a shift quantity from the middle of the edge of the opening toward the second region is ΔL, can be given.