Patent ID: 8604551

Claim:
A semiconductor device comprising: a substrate; a first region including: a first trench; a first epitaxial layer including a first source/drain having a first part and a second part, the first part extending from a top surface of the substrate to a top surface of the first source/drain and the second part extending from the top surface of the substrate to a bottom surface of the first source/drain in the first trench; and a first gate electrode disposed adjacent to the first source/drain in a first direction and disposed on the substrate, a second region including: a second trench; a second epitaxial layer including a second source/drain having a first part and a second part, the first part extending from the top surface of the substrate to a top surface of the second source/drain and the second part extending from the top surface of the substrate to a bottom surface of the second source/drain in the second trench; and a second gate electrode disposed adjacent to the second source/drain in the first direction and disposed on the substrate, wherein the cross-sectional shape of the first part of the first source/drain is the same as the cross-sectional shape of the first part of the second source/drain, and wherein the cross-sectional shape of the second part of the first source/drain is different from the cross-sectional shape of the second part of the second source/drain.