Patent ID: 8207042

Claim:
A method of manufacturing a semiconductor device, comprising: forming a gate insulating film on a silicon substrate; forming a gate electrode on the gate insulating film; forming two first conductivity type impurity diffused layers in the silicon substrate using the gate electrode as a mask; forming a trench in each of the impurity diffused layers; and epitaxially growing a first conductivity type semiconductor layer from a bottom of the trench, wherein a conductivity type of a region of the silicon substrate immediately below the gate insulating film is a second conductivity type, and said epitaxially growing the semiconductor layer comprises: forming a first region including a portion located within or lower than a same plane with an interface between the silicon substrate and the gate insulating film; and forming a second region closer to a bottom side of the trench than the first region before forming the first region, the second region having a lattice constant closer to a lattice constant of silicon than a lattice constant of the first region.