Patent ID: 7495280

Claim:
A metal-oxide-semiconductor (MOS) device comprising: a substrate; a gate structure overlying the substrate; a sidewall spacer on a sidewall of the gate structure, wherein the sidewall spacer is L-shaped having a vertical leg and a horizontal leg; a corner spacer comprising: a first portion on the substrate and adjacent an edge of the horizontal leg of the sidewall spacer; a second portion on the horizontal leg and adjacent the vertical leg of the sidewall spacer, wherein the first and the second portions of the corner spacer are disconnected; and a third portion on top of the vertical leg of the sidewall spacer, wherein the second and the third portions of the corner spacer are disconnected; a source/drain region substantially aligned with an interface between the sidewall spacer and the first portion of the corner spacer; and a silicide region substantially aligned with an outer edge of the first portion of the corner spacer.