Patent ID: 9640440
Date: 2017-05-02
CPC Classifications: H01L,Y10S

Claim:
1. A manufacturing method of a semiconductor device, comprising the steps of: (a) providing a semiconductor substrate; (b) forming a first gate electrode via a first gate insulating film and a second gate electrode via a second gate insulating film over the semiconductor substrate; (c) forming a first insulating film over the semiconductor substrate to cover the first gate electrode and the second gate electrode, the first insulating film having first portions on upper surfaces of first and second gate electrodes and second portions on side surfaces of first and second gate electrodes; (d) forming a first sidewall insulating film selectively formed on the second portions at the side surfaces of the second gate electrode; (e) after the step (d), etching back the first sidewall insulating film and the first insulating film to thereby form a second sidewall insulating film with a first width made of the first insulating film, over the side surface of the first gate electrode and a third sidewall insulating film with a second width made of the first insulating film, over the side surface of the second gate electrode, wherein the first width is smaller than the second width.