Patent ID: 10872952

Abstract:
A MOSFET according to the present invention includes a semiconductor base substrate having a super junction structure. A gate electrode is on a first main surface side of the semiconductor base substrate by way of a gate insulation film, wherein in a state where a total amount of dopant in an n-type column region differs from a total amount of dopant in a p-type column region, assuming a depth position where an average positive charge density ρ(x) becomes 0 as Xm′, assuming a deepest depth position of the surface of the depletion layer on the first main surface side as X0′, assuming a depth position where the reference average positive charge density ρ0(x) becomes 0 as Xm, and assuming a deepest depth position of the depletion layer on the first main surface side as X0, a relationship of |X0−X0′|<|Xm−Xm′| is satisfied.