Patent ID: 7989888

Claim:
A semiconductor device comprising: a semiconductor substrate of a first conductivity type comprising a first and second main surface, the second main surface being opposite to said first main surface; an implantation zone pattern being formed in that first main surface; an emitter zone of a second conductivity type formed adjacent to said second main surface; a first field stop zone of said first conductivity type defined by implanted first dopant atoms with a first dopant concentration and formed adjacent to said emitter zone in said semiconductor substrate, at least part of said first dopant atoms having an energy level that is at least 0.15 eV below the energy level of the conduction band edge of said semiconductor substrate; and a second field stop zone of a first conductivity type defined by implanted protons of a second dopant concentration and formed between said first field stop zone and said first main surface, wherein said first field stop zone has a depth of penetration that is less than about 1 μm with respect to said second main surface, wherein said first field stop zone is produced by laser annealing, and wherein said first field stop zone comprises a combination of implanted selenium or sulphur atoms with implanted phosphorus or arsenic atoms.