Patent ID: 8415224

Claim:
A method of fabricating a semiconductor device, the method comprising: providing a semiconductor substrate having a first semiconductor device region and a second semiconductor device region defined therein and including a bottom surface and a top surface; forming a first gate structure in the first semiconductor device region; forming a second gate structure in the second semiconductor device region, the second gate structure spaced apart from the first gate structure in a first direction, the first direction perpendicular to a second direction extending between the top surface and bottom surface; forming a first trench adjacent to a first side of the first gate structure in the first direction; forming a second trench adjacent to a first side of the second gate structure in the first direction; and forming a first semiconductor pattern in the first trench and forming a second semiconductor pattern in the second trench, wherein the first and second trenches have different cross-sectional shapes from each other, when viewed from a third direction perpendicular to the first and second directions.