Non-planar semiconductor device having hybrid geometry-based active region

1. A semiconductor device, comprising:

a hybrid channel region comprising an omega FET portion disposed above and on a nanowire portion disposed above a fin-FET portion, the omega FET portion having a wider portion on a narrower portion, the narrower portion on the nanowire;

a gate stack disposed on exposed surfaces of the hybrid channel region, the gate stack comprising a gate dielectric layer and a gate electrode disposed on the gate dielectric layer, the gate stack completely separating the nanowire portion from the fin-FET portion of the hybrid channel region; and

source and drain regions disposed on either side of the hybrid channel region.

2. The semiconductor device of claim 1 , wherein the nanowire portion and the fin-FET portion of the hybrid channel region consist essentially of a first semiconductor material, and wherein the omega-FET portion comprises a bi-layer comprising an upper layer consisting essentially of the first semiconductor material and a lower layer consisting essentially of a second, different, semiconductor material.

3. The semiconductor device of claim 2 , wherein the first semiconductor material is silicon, and the second semiconductor material is silicon germanium.

4. The semiconductor device of claim 2 , wherein the lower layer of the omega-FET portion of the hybrid channel region is disposed on the nanowire portion of the hybrid channel region.

5. The semiconductor device of claim 1 , wherein the fin-FET portion of the hybrid channel region is continuous with a bulk semiconductor substrate.

6. The semiconductor device of claim 5 , wherein the gate stack is isolated from the bulk semiconductor substrate by a shallow trench isolation (STI) region or a bottom gate isolation (BGI) structure.