A semiconductor device includes a semiconductor substrate including a corrugated surface. A body has a first conductivity type and includes a portion extending continuously along the corrugated surface. A gate dielectric layer is on the body and extends continuously along the corrugated surface. A gate is on the gate dielectric layer, the gate extending continuously along the corrugated surface. A corrugated conformal drift region has a second conductivity type opposite from the first conductivity type, and is on and conformal with the corrugated surface of the semiconductor substrate, and extends continuously along the corrugated surface. A source has the second conductivity type and includes a portion extending continuously along the corrugated surface, the source being in contact with the body. A drain contact region electrically coupled to the drift region and having the second conductivity type.

A semiconductor device includes a substrate, a gate structure, a drain region and a source region. The substrate includes a first step structure. The first step structure includes a first step portion, a connecting portion and a second step portion arranged sequentially along a direction, and the second step portion is higher than the first step portion. The gate structure is disposed on the connecting portion. The drain region is disposed in the first step portion. The source region is disposed in the second step portion.

An integrated circuit includes both core transistors in a core circuitry region and I/O transistors in an I/O circuitry region. A layout of the integrated circuit includes semiconductor fins extending in a first direction and gate structures extending in a second direction. Core CPODE regions are formed between core transistors in a semiconductor fin. I/O CPODE regions are formed between I/O transistors in a semiconductor fin.

A method for fabricating a semiconductor device includes receiving a silicon substrate having an isolation feature disposed on the substrate and a well adjacent the isolation feature, wherein the well includes a first dopant. The method also includes etching a recess to remove a portion of the well and epitaxially growing a silicon layer (EPI layer) in the recess to form a channel, wherein the channel includes a second dopant. The method also includes forming a barrier layer between the well and the EPI layer, the barrier layer including at least one of either silicon carbon or silicon oxide. The barrier layer can be formed either before or after the channel. The method further includes forming a gate electrode disposed over the channel and forming a source and drain in the well.

A device includes a gate structure, a source/drain structure, a source/drain conductor, a barrier layer, and a dielectric liner layer. The gate structure is over a semiconductor structure and includes a gate dielectric layer and at least one titanium-containing metal layer over the gate dielectric layer. The source/drain structure is adjacent the gate structure and a sidewall of the semiconductor structure. The source/drain conductor is over the source/drain structure. The barrier layer warps around the source/drain conductor. The dielectric liner layer is on a sidewall of the barrier layer. Both the dielectric liner layer and the barrier layer extend into the source/drain structure.