Patent ID: 7968970
Filing Date: 2011-06-28
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor substrate with a high concentration impurity of a first type conductivity; an epitaxial layer with a low concentration impurity provided on said semiconductor substrate with said high concentration impurity of a first type conductivity; a trench coupled to said semiconductor substrate with said high concentration impurity of a first type conductivity being provided in said epitaxial layer with said low concentration impurity; a high concentration impurity region of the first type conductivity, formed in at least said epitaxial layer with said low concentration impurity along an inner wall of said trench so as to directly contact said epitaxial layer with said low concentration impurity and coupled to said semiconductor substrate with said high concentration impurity of a first type conductivity; an insulating film formed on said epitaxial layer with said low concentration impurity; and a contact formed on said high concentration impurity region of the first type conductivity and in said insulating film.