Patent ID: 9190484
Filing Date: 2015-11-17
Classification: H01L

Abstract:
1. A semiconductor device comprising: a substrate formed of a semiconductor material and having a frustoconical protrusion structure with a first width protruding out of the plane of from a top surface of the substrate, the substrate formed of a semiconductor material; a drain region with a second width disposed within the substrate adjacent to the frustoconical protrusion structure and extending to a bottom portion of the frustoconical protrusion structure, wherein the drain region is formed of the semiconductor material and has a first doping type polarity; a gate stack with a third width disposed over the substrate, wherein the gate stack has a planar portion that is parallel to the top surface of substrate and wherein the gate stack has a gating surface that wraps around a middle portion of the frustoconical protrusion structure, including overlapping with the drain region; an isolation dielectric layer disposed between the planar portion of the gate stack and the drain region; a source region disposed as a top portion of the frustoconical protrusion structure, including overlapping with a top portion of the gating surface of the gate stack, wherein the source region is formed of the semiconductor material and has a second doping type polarity that is opposite the first doping type polarity; and a substrate region disposed at a middle portion of the frustoconical protrusion structure, wherein the substrate region is formed of the semiconductor material such that the semiconductor material of the substrate region physically contacts the semiconductor material of the source and drain regions.