Patent ID: 8049248
Filing Date: 2011-11-01
Classification: H01L

Abstract:
1. A semiconductor device comprising: a thyristor in which a first-conductivity-type first region, a second-conductivity-type second region having a conductivity type reverse to the first conductivity type first region, a first-conductivity-type third region, and a second-conductivity-type fourth region are arranged to form junctions, wherein; the third region is formed on a semiconductor substrate separated by an element isolation region; and a gate electrode formed over a gate insulating film and a side wall formed adjacent the gate electrode, and the fourth region is formed so that one end thereof covers a joint portion between the third region and extends beyond the joint portion and the other end of the fourth region is joined with the sidewall, wherein the fourth region excluding a portion where a metal silicide layer is formed, has a thickness equal to or larger than a film thickness of a depletion layer at the fourth region side generated at the interface between the fourth region and the third region, wherein the second region has a film thickness not smaller than the sum of a depletion layer of the second region side generated at the interface between the first region and the second region, and a depletion layer of the second region side generated at the interface between the second region and the third region.