Patent ID: 7595531

Claim:
A semiconductor device comprising: a semiconductor substrate having an operation layer on a top surface thereof; a source electrode and a drain electrode disposed on the operation layer, current flowing from the source electrode to the drain electrode through the operation layer; a gate electrode disposed between the source electrode and the drain electrode; and a field plate electrode coupled to the gate electrode and disposed on an insulating film deposited between the gate electrode and the drain electrode, wherein at least a part of the gate electrode is disposed in a gate recess formed in the operation layer, the field plate electrode is apart from the gate electrode by a predetermined distance, and at least a part of the field plate electrode is disposed in a field plate recess formed in the operation layer, wherein a depth of the field plate recess is substantially equal to a depth of the gate recess, the depth is a distance, from the top surface to a bottom, substantially perpendicular to the current flow.