Patent ID: 9324867
Filing Date: 2016-04-26
CPC Classification: H01L

Claim Text:
1. A method of forming a semiconductor device comprising: forming a sacrificial gate structure on a channel portion of a fin structure that is comprised of a silicon including material; forming a gate sidewall spacer on sidewalls of the sacrificial gate structure; forming a germanium including material on source and drain region portions of a fin structure; driving germanium from the germanium including material into the source and drain region portions of the fin structure to provide an alloyed silicon and germanium portion of the fin structure adjacent to an interior portion of the fin structure comprised of silicon, wherein the driving of the germanium from the germanium including material into the fin structure includes a portion of germanium that diffused to a portion of the fin structure underlying the gate sidewall spacer; removing the alloyed silicon and germanium portion selectively to the interior portion of the fin structure comprised of silicon; forming epitaxial source regions and epitaxial drain regions on the source and drain region portions of the fin structure; and replacing the sacrificial gate structure with a function gate structure.