Patent ID: 9691862
Date: 2017-06-27
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising a field effect transistor in a semiconductor substrate having a first surface, the field effect transistor comprising: a source region, a drift zone and a drain region each of a first conductivity and formed in the semiconductor substrate; a body region of a second conductivity opposite the first conductivity type and formed in the semiconductor substrate, the body region separating the source region from the drift zone; a first field plate structure and a second field plate structure, each extending in a first direction parallel to the first surface, and each extending into the semiconductor substrate adjacent to and deeper than the drift zone whereby a bottom side of a conductive material of the first and second field plate structures is disposed below a bottom side of the drift zone; and gate electrode structures disposed over the first surface and extending in a second direction parallel to the first surface, the gate electrode structures being disposed between the first and the second field plate structures.