Patent ID: 6979865
Filing Date: 2005-12-27
Classification: H01L

Abstract:
1. A cellular MOSFET device comprising active device cells in a cellular area of a semiconductor body, wherein: each active device cell has a channel-accommodating region of a second conductivity type between a surface-adjacent source region and an underlying drain region that are of a first conductivity type, a gate electrode dielectrically coupled to the channel-accommodating region for controlling a conduction channel between the source and drain regions in operation of the device, and a source electrode connected to the source region and to the channel-accommodating region; the cellular area is laterally bounded by an end structure including a deep end region of the second conductivity type that adjoins the channel-accommodating region and has a greater depth and a higher doping concentration than the channel-accommodating region; the device also comprises, at a diode area of the body, a Schottky diode having a Schottky barrier that is integrated between the source electrode and a diode portion of the drain region that is of the first conductivity type; and the deep end region is laterally divided to accommodate the diode area within the deep end region of the end structure, with the diode portion of the first conductivity type extending upwardly through the deep end region of the second conductivity type, and with the Schottky barrier terminating laterally in the laterally divided portions of the deep end region which serve as a field-relief region for the Schottky diode.