Patent ID: 7008831

Claim:
A method of manufacturing a semiconductor device, comprising: forming a gate insulating film on a first conductivity type layer of a semiconductor substrate; forming on the gate insulating film, a gate electrode having slits at, at least, one end thereof; selectively implanting a second conductivity type impurity in the first conductivity type layer with a gate electrode as a mask; and effecting heat treatment to activate the impurity and integrating impurity regions in which the impurity is implanted in the slits, and impurity regions in the neighborhood of the slits in which the impurity is implanted in portions outside the gate electrode, thereby forming a pair of second conductivity type layers which overlap with the gate electrode, at the one end thereof; and forming within the pair of second conductivity type layers, a pair of second conductivity type high-density layers which are spaced away from the gate electrode and adapted to contact source and drain electrodes respectively.