Patent ID: 9673280
Date: 2017-06-06
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a substrate formed of a semiconductor material; a gate structure formed over the substrate; source and drain regions formed of the semiconductor material on both sides of the gate structure in the substrate; a first semiconductor alloy layer portion in the substrate below the gate structure, the first semiconductor alloy layer portion being formed of a material that is different than the semiconductor material; and a second semiconductor alloy layer portion in the substrate overlying the source and drain regions, the second semiconductor alloy layer portion being thinner than the first semiconductor alloy layer portion, the second semiconductor alloy layer portion being formed of a material that is different than the semiconductor material, wherein the material of the second semiconductor alloy layer portion is a silicide of the material of the first semiconductor alloy layer portion, and wherein the second semiconductor alloy layer portion extends to the substrate.