Patent ID: 8614133
Filing Date: 2013-12-24
Classification: H01L

Abstract:
1. A method of forming a semiconductor device comprising: forming a gate structure on a semiconductor substrate, wherein a first source region and a first drain region are on opposing sides of the gate structure; forming a first spacer in direct contact with sidewalls of the gate structure having a first width that exposes a portion of the first source region and the first drain region; forming a second spacer on the sidewalls of the gate structure, wherein the second spacer has a second width that is less than the first width and covers the entire length of the first source region and the first drain region; and forming a second source region and a second drain region on the exposed portion of the first source region and the first drain region, the second source region and the second drain region have an upper surface that is raised relative to the channel region of the semiconductor substrate.