Patent ID: 9171928
Filing Date: 2015-10-27
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device having a first metal-insulator-semiconductor field-effect transistor (MISFET), the method comprising steps of: (a) providing a semiconductor substrate; (b) forming a first gate electrode for the first MISFET over the semiconductor substrate via a gate insulating film; (c) after the step (b), forming a first insulating film over the semiconductor substrate to cover the first gate electrode; (d) after the step (c), forming a second insulating film over the first insulating film; (e) after the step (d), forming a first sidewall spacer including the first insulating film and the second insulating film over a sidewall of the first gate electrode by etching back the second insulating film and the first insulating film; (f) after the step (e), forming first source and drain regions for the first MISFET in the semiconductor substrate by performing ion-implantation in the semiconductor substrate using the first gate electrode and the first sidewall spacer as a mask; (g) after the step (f), isotropically etching the first sidewall spacer under conditions in which the first insulating film is etched less than the second insulating film to decrease a thickness of the first sidewall spacer, wherein after the step (g), the first sidewall spacer is formed of the first insulating film and the second insulating film, and wherein in the step (g), an edge of a part of the first insulating film adjacent the source and drain regions forming the first sidewall spacer and extending over the semiconductor substrate protrudes from a side surface of the second insulating film forming the first sidewall spacer by the isotropic etching; (h) after the step (g), forming a reaction layer resulting from a reaction between metal and the first source and drain regions over the first source and drain regions; (i) after the step (h), forming a third insulating film over the semiconductor substrate to cover the first gate electrode and the first sidewall spacer; (j) after the step (i), forming a fourth insulating film over the third insulating film; and (k) after the step (j), forming a contact hole in the fourth insulating film and the third insulating film.