Patent ID: 6750511
Filing Date: 2004-06-15
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor layer of a first conductivity type; a semiconductor region of a second conductivity type formed on the semiconductor layer; a semiconductor region of a first conductivity type selectively provided on the semiconductor region of the second conductivity type; a trench extending from the semiconductor region of the first conductivity type through the semiconductor region of the second conductivity type to the semiconductor layer of the first conductivity type; an insulating layer provided over an inner wall of the trench; a conductor formed on the insulating layer in the trench; and an electrode connected to the semiconductor region of the first conductivity type, the semiconductor region of the first conductivity type having a portion in contact with the electrode, the portion having a higher concentration of impurity of the first conductivity type than a remaining portion of the semiconductor region of the first conductivity type, wherein the portion having the higher concentration of impurity is provided apart from the semiconductor region of the second conductivity type.