Patent ID: 8164085
Filing Date: 2012-04-24
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a silicon substrate; a gate insulating film formed over the silicon substrate; a gate electrode formed over the gate insulating film; a first side wall insulating film formed on a side wall of the gate electrode and on the silicon substrate; a second side wall insulating film formed on the first side wall insulating film; a source extension region and a drain extension region having a first conductivity type formed in the silicon substrate; a source region and a drain region having the first conductivity type formed in the silicon substrate in contact with the source extension region and the drain extension region respectively; trenches formed in the source region and the drain region; concave portions between a bottom surface of the second side wall insulating film and the silicon substrate; and semiconductor mixed crystal layers formed in the trenches and the concave portions and in contact with a side surface of the second side wall insulating film.