Patent ID: 6340617
Filing Date: 2002-01-22
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device comprising the steps of:(a) forming an insulated gate electrode on a surface of a silicon substrate; (b) laminating two or more films made of materials having different etching characteristics on the surface of the silicon substrate, the films covering the insulated gate electrode; (c) anisotropically etching part of the two or more films using at least one of the two or more films which remains as an etching stopper, covering the insulated gate and the silicon substrate thereby forming side wall spacers on side walls of the insulated gate electrode with said part of the two or more films; (d) implanting impurity ions into the surface of the silicon substrate by using a mask the insulated gate electrode and the side wall spacers; (e) activating the implanted impurities to a first level; (f) removing the at-least-one film exposed outside the side wall spacers to expose an upper surface of the insulated gate electrode and a partial surface area of the silicon substrate; (g) forming a metal film capable of being silicided on the surface of the silicon substrate, the metal film covering the exposed surface of the silicon substrate and the insulated gate electrode; (h) performing a first silicidation reaction between the metal film and the exposed surface of the silicon substrate; (i) removing the unreacted portion of the metal film and the remaining at-least-one film under the unreacted portion; (j) implanting impurity ions shallowly in the surface layer of the silicon substrate by using as a mask the insulated gate electrode; and (k) activating the shallowly implanted impurities to a second level lower than the first level to perform at a same time a second silicidation reaction for silicide formed by the first silicidation reaction, wherein the above steps are carried out in this order.