Patent ID: 7863656

Claim:
A semiconductor device having a source contact ( 1 ) and a drain contact ( 2 ) interconnected by a drift layer ( 3 ) doped by dopants according to a first conductivity type, n or p, for majority charge carrier transport in a conducting path ( 13 ) between the source contact and the drain contact in a forward biased state of the device, said device also comprising regions ( 7 , 8 , 15 - 17 ) doped by dopants according to a second conductivity type being opposite to said first type, said regions being arranged next to the drift layer so as to deplete parts thereof and being able to form a blocking pn-junction in said conducting path between the source contact and the drain contact for preventing a current to flow between the source contact and the drain contact in a blocking state of the device, wherein said drift layer and said regions are of a semiconductor material having an ionisation energy Ei of said dopants of said second conductivity type in this semiconductor material exceeding 0.5 eV and/or a solubility of said dopants of said second conductivity type in this semiconductor material being less than 10 18 cm âˆ’3 .