Patent ID: 7312500

Claim:
A semiconductor device comprising: a semiconductor substrate having an active region defined thereon and having the first impurities of the first conductivity type introduced into said active region; a source region and a drain region formed by introducing the second impurities of the second conductivity type into said active region; and a gate electrode patterned, through a gate insulator, on a channel region between said source region and said drain region of said active region, wherein said active region has a residual defect plane formed on a portion which is deeper than the depth of the interface between said source region and said drain region, a region from the surface to said residual defect plane being recrystallized from the amorphous condition, and said channel region, with its surface layer substantially not containing impurities, is formed so that the concentration of said first impurity increases in a steep, step-wise manner at the interface between said surface layer and the interior of said channel region.