Patent ID: 11967625
Assignee: SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A metal-oxide semiconductor field-effect transistor (MOSFET) device, comprising:
a semiconductor substrate of a first conductivity type, the substrate serving as a drain region in the MOSFET device;
an epitaxial region of the first conductivity type disposed on an upper surface of the substrate;
a plurality of body regions of a second conductivity type formed in the epitaxial region, the second conductivity type being opposite in polarity to the first conductivity type, the body regions being disposed proximate an upper surface of the epitaxial region and spaced laterally from one another;
a plurality of source regions of the first conductivity type, each of the source regions being disposed in a corresponding one of the body regions proximate an upper surface of the body region; and
a gate structure comprising a plurality of planar gates and a trench gate, each of the planar gates being disposed on the upper surface of the epitaxial region and overlapping at least a portion of a corresponding body region, the trench gate being formed at least partially through the epitaxial region and between the body regions;
wherein the trench gate includes a dielectric material disposed on sidewalls and a bottom of the trench gate for electrically isolating the trench gate from the epitaxial region, and wherein the epitaxial region surrounds the dielectric material of the trench gate to isolate the dielectric material of the trench gate from the plurality of body regions.