Patent ID: 8497563

Claim:
A semiconductor system having a trench MOS barrier Schottky diode, comprising at least a combination of Schottky diode, MOS structure, and a PN diode as a clamping element, wherein the PN diode is configured as an integrated substrate PN diode, and the breakdown voltage of the substrate PN diode is lower than the breakdown voltage of the Schottky diode and the breakdown voltage of the MOS structure, wherein: an n-epitaxial layer is situated on an n + substrate and acts as a cathode zone of the Schottky diode, and a metal layer on the n-epitaxial layer acts as an anode of the Schottky diode, in a two-dimensional representation there are situated at least two trenches etched through the n-epitaxial layer down to the n + substrate and oxide layers on side walls thereof, regions between the oxide layers in the trenches are filled with p-doped Si or poly-Si, and act as an anode zone of the substrate PN diode, and the n+ substrate acts as a cathode of the substrate PN diode, and thin p + layers are situated in upper regions of the trenches for ohmic contact with the metal layer.