Patent ID: 8003472
Filing Date: 2011-08-23
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising: forming a first region and a second region in a semiconductor substrate, the first and second regions being element-isolated; depositing a gate electrode material layer on the semiconductor substrate via a gate insulating film; processing the gate electrode material layer of the first region into a first gate electrode; implanting ions into the first region while using the first gate electrode as a mask, thereby forming a first LDD diffusion layer for a first transistor; depositing a first insulating film on a whole surface; processing the gate electrode material layer and the first insulating film over the second region into a second gate electrode having a gate length shorter than that of the first gate electrode; implanting ions into the second region while using the second gate electrode as a mask, thereby forming a second LDD diffusion layer for a second transistor; depositing a second insulating film on a whole surface; processing the second insulating film over the second region into second sidewalls of the second gate electrode; processing the second insulating film and the first insulating film over the first region into first sidewalls of the first gate electrode; selectively epitaxially growing a semiconductor layer on at least the first LDD diffusion layer exposed from the first sidewalls of the first region; and implanting ions into the semiconductor substrate via the semiconductor layer of the first region, thereby forming an elevated source/drain structure, wherein the first insulating film and the second insulating film are films that do not inhibit the growth of the semiconductor layer.