Patent ID: 8592895
Filing Date: 2013-11-26
Classification: H01L

Abstract:
1. A MOSFET, comprising: a trench having a lower portion and an upper portion, the trench being disposed in a semiconductor region; a shield electrode disposed in the lower portion of the trench, the shield electrode being insulated from the semiconductor region by a shield dielectric, the shield electrode having a curved bottom surface; a gate electrode disposed in the upper portion of the trench, the gate electrode being over but insulated from the shield electrode, the lower portion of the trench having a width narrower than a width of the upper portion of the trench, at least a portion of a top surface of the gate electrode having a slope non-parallel to a bottom surface of the gate electrode; and an inter-poly dielectric disposed between the shield electrode and the gate electrode, the semiconductor region, which defines at least a portion of a mesa, including: