Patent ID: 8847311
Filing Date: 2014-09-30
Classification: H01L

Abstract:
1. A semiconductor device comprising a transistor, formed in a semiconductor substrate having a first main surface, the transistor comprising: a channel region doped with dopants of a first conductivity type; a source region doped with dopants of a second conductivity type different from the first conductivity type; a drain region doped with dopants of the second conductivity type; a drain extension region; and a gate electrode adjacent to the channel region, the channel region being disposed in a first portion of a ridge, the drain extension region being disposed in a second portion of the ridge, the drain extension region comprising a core portion doped with the first conductivity type, the drain extension region further comprising a cover portion doped with the second conductivity type, the cover portion being adjacent to at least one or two sidewalls of the second portion of the ridge.