Patent ID: 7759730
Filing Date: 2010-07-20
Classification: H01L

Abstract:
1. A semiconductor device comprising: (a) a semiconductor substrate of a first conductivity type; (b) a gate trench formed in a main surface of the semiconductor substrate; (c) a gate insulating film formed over an inner wall and a bottom portion of the gate trench; (d) a gate electrode formed so as to fill the gate trench and a portion of which protrudes from the semiconductor substrate; (e) a sidewall formed over a side wall portion of the gate electrode protruding from the semiconductor substrate; (f) a source region of the first conductivity type, formed so as to be adjacent to the gate electrode; (g) a body trench formed between the sidewalls formed on adjacent gate electrodes by self-alignment with the gate electrodes, so as to be deeper than a depth of the source region; (h) a first semiconductor region formed at a bottom portion of the body trench and having a second conductivity type that is different from the first conductivity type; (i) a drain region of the first conductivity type, formed in an opposite surface to the main surface of the semiconductor substrate; and (j) a first metal silicide film formed over the gate electrode, the source region, and the first semiconductor region, wherein the source region and the first semiconductor region are electrically coupled to each other by the first metal silicide film.