Patent ID: 7824975
Filing Date: 2010-11-02
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device, the method comprising: defining a first region and a second region in a substrate, comprising forming a relatively thin first spacer layer in the first region and forming a relatively thick spacer layer in the second region by a spacer forming process; forming a first gate electrode layer pattern and a second gate electrode layer pattern in the first region and the second region on the substrate, respectively; performing first ion implantation processes of first doses of implanted ions on a side wall of the first gate electrode pattern; performing second ion implantation processes of second doses of implanted ions on a side wall of the second gate electrode pattern, wherein the second doses are different from the first doses; forming first gate spacer layers having a different thickness on the first gate electrode and the second gate electrode, respectively; and forming second gate spacer layers on the first gate spacer layers.