Patent ID: 9379234
Filing Date: 2016-06-28
CPC Classification: H01L

Claim Text:
1. A semiconductor device, comprising: a first electrode; a second electrode; a first semiconductor region of a first conductivity type provided between the first electrode and the second electrode; a second semiconductor region of a second conductivity type provided between the first semiconductor region and the second electrode, wherein the first conductivity type is different from second conductivity type; a third semiconductor region of the first conductivity type provided between the second semiconductor region and the second electrode, and the third semiconductor region having an impurity concentration higher than an impurity concentration of the first semiconductor region; a third electrode contacting the third semiconductor region, the second semiconductor region, and the first semiconductor region via an insulating film; a fourth semiconductor region of the second conductivity type provided between the first semiconductor region and the second electrode, the fourth semiconductor region including a first portion and second portions, the first portion being provided between the second portions; and a fifth semiconductor region of the first conductivity type provided between the fourth semiconductor region and the second electrode, and the fifth semiconductor region having an impurity concentration higher than the impurity concentration of the first semiconductor region, the fifth semiconductor region being provided between the first portion and the second electrode, and a distance between a first boundary between the second electrode and the fifth semiconductor region and a second boundary between the first semiconductor region and one of the second portions being larger than a distance between the first boundary and a third boundary between the first semiconductor region and the first portion in a first direction from the first electrode toward the second electrode.