Patent ID: 8884365

Claim:
A field effect transistor comprising: a body region of a first conductivity type disposed within a semiconductor region of a second conductivity type; a gate trench extending through the body region and terminating within the semiconductor region; a flared shield dielectric layer disposed in a lower portion of the gate trench, the flared shield dielectric layer including a flared portion that extends under the body region; a conductive shield electrode disposed in the gate trench, at least a portion of the conductive shield electrode being disposed within the flared shield dielectric; a source region of the second conductivity type disposed in the body region and in contact with an upper portion of a sidewall of the gate trench; a drift region disposed below the body region and in contact with a lower portion of the sidewall of the gate trench; a channel region disposed along the sidewall of the gate trench between the source region and the drift region; and a channel enhancement region of the second conductivity type, the channel enhancement region partially extending into a lower portion of the channel region.