Patent ID: 8907420

Claim:
A power semiconductor device having a cell section for passing current and an edge termination section surrounding the cell section, the power semiconductor device comprising: a first semiconductor layer of a first conductivity type; a plurality of second semiconductor layers of the first conductivity type and a plurality of third semiconductor layers of a second conductivity type formed on the first semiconductor layer of the first conductivity type in the cell section and alternately arranged along at least one direction parallel to a surface of the first semiconductor layer of the first conductivity type; a first main electrode electrically connected to the first semiconductor layer of the first conductivity type; a fourth semiconductor layer of the second conductivity type selectively formed in a surface of a structure including the plurality of the second semiconductor layers of the first conductivity type and a surface of the plurality of the third semiconductor layers of the second conductivity type; a fifth semiconductor layer of the first conductivity type selectively formed in a surface of the fourth semiconductor layer of the second conductivity type; a second main electrode connected to the fourth semiconductor layer of the second conductivity type and the fifth semiconductor layer of the first conductivity type; and a control electrode formed above the fourth semiconductor layer of the second conductivity type, the fifth semiconductor layer of the first conductivity type, and the plurality of the second semiconductor layers of the first conductivity type via a gate insulating film in the cell section, each of at least one of the plurality of the third semiconductor layers of the second conductivity type, except outermost ones of the plurality of the third semiconductor layers of the second conductivity type, having a dopant concentration profile along the one direction, the dopant concentration profile having a local minimum at a center of the each of the at least one of the plurality of the third semiconductor layers in the one direction, and the dopant concentration profile of the each of the at least one of the plurality of the third semiconductor layers further having a first local maximum and a second local maximum, the first local maximum being between the center and one edge of the each of the at least one of the third semiconductor layers in the one direction, and the second local maximum being between the center and other edge of the each of the at least one of the third semiconductor layers in the one direction.