Patent ID: 7514747
Filing Date: 2009-04-07
Classification: H01L

Abstract:
1. A semiconductor device formed in a silicon-on-insulator (SOI) substrate including an insulating layer and a semiconductor layer disposed on the insulating layer, the semiconductor device including a gate electrode, a gate insulation film sandwiched between the gate electrode and the semiconductor layer, and a source region and a drain region of a first conductive type formed in the semiconductor layer on mutually opposite sides of the gate electrode, the source region and the drain region having a first carrier concentration, wherein the semiconductor layer comprises: a channel region of a second conductive type opposite to the first conductive type, the channel region being disposed below the gate electrode, the channel region being doped to have a second carrier concentration; and a low-carrier-concentration layer of the second conductive type disposed partly below the channel region, making contact with the source region and the channel region, the low-carrier-concentration layer being doped to have a third carrier concentration lower than the second carrier concentration.