Patent ID: 6787847
Filing Date: 2004-09-07
Classification: H01L

Abstract:
A vertical high-voltage transistor comprising:a substrate; a source region of a first conductivity type; a drift region comprising an epitaxial layer of semiconductor material of the first conductivity type that extends in a vertical direction to contact the source region and the substrate, the epitaxial layer having a linearly graded doping profile and the drift region having first and second sidewalls; first and second dielectric layers disposed along the first and second sidewalls, respectively; first and second field plate members that respectively extend in the vertical direction adjacent to the first and second dielectric layers, the first and second dielectric layers insulating the first and second field plate members from the first and second sidewalls, respectively, each of the first and second field plate members being insulated from the substrate and oriented substantially in parallel with the first and second sidewalls, respectively; a source electrode electrically connected to the source region; and a drain electrode electrically connected to the substrate, current flowing vertically from the source electrode, through the source region, the drift region, and the substrate, to the drain electrode when the vertical high-voltage transistor operates in an on-state, the drift region being pinched-off when the vertical high-voltage transistor operates in an off-state.