Patent ID: 9048282
Filing Date: 2015-06-02
Classification: H01L

Abstract:
1. An insulated gate bipolar transistor (IGBT) device supported in a semiconductor substrate wherein: the semiconductor substrate comprising an epitaxial layer of a first conductivity type supported on a bottom layer of a second conductivity type electrically contacting a collector electrode disposed on a bottom surface of the semiconductor substrate; the IGBT device further comprises a body region of the second conductivity type disposed near a top surface of the semiconductor substrate encompassing a source region of the first conductivity type below a top surface of the semiconductor substrate; the epitaxial layer further includes an upper heavily doped layer having a higher dopant concentration of the first conductivity type below the body region; the IGBT device further comprises a trench gate and a planar gate disposed on the top surface of the semiconductor substrate wherein the trench gate extends downwardly below and substantially from a midpoint of the planar gate; and at least a second trench filled with a gate material disposed at substantially a periphery portion of the IGBT device at a distance away from the trench gate and the planar gate and is electrically connected to a source electrode.