Patent ID: 8603882
Filing Date: 2013-12-10
Classification: H01L

Abstract:
1. A method for making a dual silicide semiconductor comprising: providing a semiconductor substrate; forming a gate assembly comprising: forming source/drain regions comprising: forming a first silicide on an exposed surface of the lightly doped source/drain regions and the heavily doped source/drain regions not covered by the spacers; reducing thickness of the spacers, after forming the first silicide, so the lightly doped source/drain regions of exposed surface are not covered by the first silicide; and forming a second silicide on an exposed surface of the lightly doped source/drain regions, wherein the first silicide is formed by a first metal layer and the source/drain regions, the second silicide is formed by a second metal layer and the source/drain regions, the first metal layer and the second metal layer are different materials.