Patent ID: 8759183
Filing Date: 2014-06-24
Classification: H01L

Abstract:
1. A method of forming a semiconductor device comprising: forming first and second active regions in a silicon substrate wherein the first and second active regions have opposite conductivity types, and wherein the first and second active regions are surrounded by a device isolation layer; forming a first gate on the first active region, wherein the first gate includes a first gate insulating layer on the first active region and a first gate electrode on the first gate insulating layer; forming a second gate on the second active region, wherein the second gate includes a second gate insulating layer on the second active region and a second gate electrode on the second gate insulating layer; forming first source/drain regions in the first active region on opposite sides of the first gate; forming second source/drain regions in the second active region on opposite sides of the second gate; forming a metal layer on at least one of the first source/drain regions and on at least one of the second source/drain regions; reacting the metal layer with the at least one of the first source/drain regions and with the at least one of the second source/drain regions to form a metal silicide on the at least one of the first source/drain regions and on the at least one of the second source/drain regions; and after reacting the metal layer, removing unreacted residue of the metal layer using an electrolyzed sulfuric acid solution; wherein the metal layer comprises nickel, and the first gate electrode comprises at least one of tungsten, molybdenum, titanium nitride, tungsten nitride, and/or tantanlum nitride.