Patent ID: 8981460
Filing Date: 2015-03-17
Classification: H01L

Abstract:
1. A vertical metal-oxide-semiconductor field effect transistor (MOSFET) structure, comprising: a gate stack formed on a top surface of a semiconductor substrate of a first conductivity type, the gate stack comprising a gate dielectric adjacent to the top surface of the semiconductor substrate and a gate electrode formed over the gate dielectric, wherein the gate dielectric comprises a charge trapping material; a drain electrode formed on a bottom surface of the semiconductor substrate; a doped source region of the first conductivity type formed within the semiconductor substrate adjacent to and below outer portions of a bottom surface of the gate dielectric; a doped body region of a second conductivity type formed within the semiconductor substrate around the doped source region, adjacent to and below inner portions of the bottom surface of the gate dielectric; a source electrode formed on the top surface of the semiconductor substrate, lateral to a side surface of the gate stack, and short-connecting the doped body region and the doped source region; and a doped drift region of the first conductivity type formed around the doped body region, adjacent to and below a center portion of the bottom surface of the gate dielectric, wherein a vertical channel is established within the vertical MOSFET structure extending from the doped source region through the doped drift region to the drain electrode.