Patent ID: 9660079
Date: 2017-05-23
CPC Classifications: H01L

Claim:
1. A method of manufacturing a semiconductor device including a MISFET of a first conductivity type, the method comprising the steps of: (a) forming a gate electrode on a semiconductor substrate through a gate insulating film; (b) after step (a), forming a stacked film including a first insulating film and a second insulating film on the first insulating film, the stacked film being disposed on the semiconductor substrate and extending along the gate electrode to cover the gate electrode; (c) after step (b), etching back the stacked film to form a first sidewall spacer on a sidewall of the gate electrode, the first sidewall spacer including the first and second insulating films; (d) after step (c), removing the second insulating film from the first sidewall spacer; (e) after step (d), epitaxially growing a first semiconductor layer for a source/drain electrode on the semiconductor substrate exposed from the first insulating film; and (f) after step (e), forming a second sidewall spacer on the sidewall of the gate electrode through the first insulating film, (g) after step (f), forming a reacted layer of a metal and the first semiconductor layer on the first semiconductor layer, wherein step (d) leaves the first insulating film including a first portion extending in a first direction along the sidewall of the gate electrode and a second portion extending in a second direction along the semiconductor substrate, the first direction being different from the second direction, in step (e), a part of the first semiconductor layer is on the second portion of the first insulating film, in step (f), a part of the second sidewall spacer is on the first semiconductor layer, and in step (f), in a gate length direction, a total thickness of a thickness of the first portion of the first insulating film and a thickness of the second sidewall spacer is less than a length of the second portion of the first insulating film extending in the second direction.