Patent ID: 7166508
Filing Date: 2007-01-23
Classification: G11C,H01L

Abstract:
1. A method of manufacturing a semiconductor device, comprising the steps of: (a) forming a first conductivity type first semiconductor region on a main surface of a semiconductor substrate; (b) forming at least a first insulating film and a second insulating film on the main surface of the semiconductor substrate on the first semiconductor region in order, the second insulating film containing nitrogen; (c) forming a first conductor element having a first width as viewed in a first direction of the main surface of the semiconductor substrate and a second width as viewed in a second direction substantially orthogonal to the first direction, over the second insulating film; (d) introducing a first impurity into the first semiconductor region in an area below one end of the first conductor element as viewed in the first direction to form a second semiconductor region of the first conductivity type with an increased impurity concentration; (e) introducing a second impurity into the first semiconductor region so as to leave the second semiconductor region below said one end of the first conductor element; (f) forming a third insulating film on a side wall of the first conductor element at said one end as viewed in the first direction; (g) forming a second conductor element having a third width as viewed in the first direction and a fourth width as viewed in the second direction at said one end of the first conductor element as viewed in the first direction with the third insulating film interposed therebetween; and (h) introducing a third impurity into an area of the first semiconductor region near a distal end of said second semiconductor element relative to said one end of said first conductor element as viewed in the first direction, so as to form a third semiconductor region of a second conductivity type within the first semiconductor region.