Patent ID: 8803233

Claim:
A transistor comprising: a semiconductor layer; a gate dielectric formed on the semiconductor layer; a gate conductor formed on the gate dielectric; an active area in the semiconductor layer underneath the gate dielectric, the active area comprising a graded dopant region that is doped with a first conductivity type dopant, the graded dopant region being heavily doped with a graded profile, such that there is a heavy dopant concentration near a top surface of the semiconductor layer that gradually decreases to a lower dopant concentration near a bottom surface of the semiconductor layer; and source and drain regions adjacent to the active area, the source and drain regions being heavily doped with the first conductivity type dopant, wherein the source and drain regions and the active area have the same conductivity type, the semiconductor layer consists of a single layer of a semiconducting material, and the active area, the source region, and the drain region are all located in the semiconductor layer.