Patent ID: 8829519

Claim:
A semiconductor device comprising: an anode portion including a first region of a first conductivity type; a cathode portion including a second region of a second conductivity type; an intermediate portion located between said anode portion and said cathode portion and joined to said anode portion and to said cathode portion; a predetermined film having a crystal defect and formed in at least one of a portion on a side of said anode and a portion on a side of said cathode, carriers of a higher density than a density of carriers present around a center in a thickness direction of said intermediate portion in a forward bias state being present in said portions on respective sides of said anode and said cathode, said intermediate portion including a predetermined substrate, and a third region of the second conductivity type formed on a surface of said substrate to be in contact with the surface of said substrate and joined to said first region; a maximum impurity density of said third region being higher than an impurity density of said predetermined substrate and lower than a maximum impurity density of said anode portion; said first region and said third region being formed of said predetermined film; and said predetermined film being one selected from a group consisting of a polysilicon film and an amorphous silicon film.