Patent ID: 7081652
Filing Date: 2006-07-25
Classification: H01L,Y10S

Abstract:
1. A semiconductor device having a side wall insulating film comprising: a semiconductor substrate, first and second projecting portions formed on the semiconductor substrate, a gate insulating film formed on the semiconductor substrate and between the first and second projecting portions, a gate electrode formed on the gate insulting film, a first diffusion layer that is formed in the first projecting portion and the semiconductor substrate, the first diffusion layer having a first portion that is formed in the semiconductor substrate, a second portion that is formed in the first projecting portion and formed on the first portion, and a third portion that is formed in the semiconductor substrate, connected to the first portion, and adjacent to the gate insulating film, a second diffusion layer that is formed in the second projecting portion and the semiconductor substrate, the second diffusion layer having a fourth portion that is formed in the semiconductor substrate, a fifth portion that is formed in the second projecting portion and formed on the fourth portion, and a sixth portion that is formed in the semiconductor substrate, connected to the fourth portion, and adjacent to the gate insulating film, first and second side wall insulating films formed on the third and six portions respectively, the first side wall insulating film located between the gate electrode and the second portion of the first diffusion layer, the second wall insulating film located between the gate electrode and the fifth portion of the second diffusion layer, each of the first and second side wall insulating films having a concave portion, and an interlayer insulating film formed so as to fulfill the concave portion and cover the gate electrode and the first and second side wall insulating films, wherein a distance between a bottom of the concave portion and a side surface of the gate electrode is 0.5X or more and X or less (0.5X≦Y≦X), the X being a distance between the side surface of the gate electrode and the second portion of the first diffusion layer, and the Y being the distance between the bottom of the concave portion and the side surface of the gate electrode.