Patent ID: 9048215
Filing Date: 2015-06-02
Classification: H01L,H03K

Abstract:
1. A semiconductor device comprising: a first semiconductor layer of a first conductivity type; a second semiconductor layer of a second conductivity type provided on the first semiconductor layer; a third semiconductor layer of the first conductivity type provided on the second semiconductor layer; a first electrode electrically connected to the second semiconductor layer and the third semiconductor layer; a second electrode electrically connected to the first semiconductor layer; a third electrode embedded in a trench provided through the third semiconductor layer and the second semiconductor layer and into the first semiconductor layer; a fourth electrode embedded in the trench below the third electrode; and an insulating layer provided in the trench around the fourth electrode, wherein the first semiconductor layer includes a first region that is in contact with the insulating layer and at which a concentration of a first conductivity type dopant is lower than the concentration of the first conductivity type dopant at a second region of the first semiconductor layer that is provided around the first region and wherein a concentration of a second conductivity type dopant is uniform across the second semiconductor layer.