Patent ID: 6753588
Filing Date: 2004-06-22
Classification: H01L

Abstract:
A semiconductor rectifier, comprising:an anode contact and a cathode contact; an intermediate semiconductor region of first conductivity type extending between the anode and the cathode contacts; at least one trenched gate electrode flanking the intermediate semiconductor region; a shield semiconductor region of second conductivity type opposite to the first conductivity type between the at least one trenched electrode and the intermediate semiconductor region, the shield semiconductor region being connected to one of the anode and the cathode contacts, the shield semiconductor region extending along the entire sidewalls of the trenched gate electrode; a gate insulating layer between the shield semiconductor region and the trenched electrode; and a separate gate contact for applying a voltage to the gate electrode to deplete the intermediate semiconductor region; wherein the intermediate semiconductor region can be depleted by applying a constant voltage to the gate electrode and a voltage of a first polarity between anode and cathode and when a voltage of opposite polarity to the first polarity is applied between anode and cathode the shield semiconductor region conducts to shield the intermediate semiconductor region from the constant voltage applied to the gate electrode to allow a conductive path through the intermediate semiconductor region between the anode and the cathode.