Patent ID: 8633070
Filing Date: 2014-01-21
Classification: H01L

Abstract:
1. A method comprising: providing a substrate; forming a gate structure over the substrate; forming inner spacers on sidewalls of the gate structure; forming an epitaxial layer in a source and drain region of the substrate that is interposed by the gate structure, wherein the epitaxial layer physically contacts the inner spacers on the sidewalls of the gate structure; after forming the epitaxial layer, forming outer spacers on the inner spacers and the epitaxial layer such that the outer spacers physically contact the inner spacers and the epitaxial layer; after forming the outer spacers, forming a heavily doped source and drain (HDD) feature in the source and drain region; and after forming the HDD feature, forming a lightly doped source and drain (LDD) feature in the source and drain region, wherein after forming the LDD feature the epitaxial layer physically contacts the inner spacers on the sidewalls of the gate structure.