Patent ID: 9136176
Filing Date: 2015-09-15
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate having a major axis extending horizontally; a first gate structure and a second gate structure disposed on the semiconductor substrate; a shallow trench isolation layer disposed in the semiconductor substrate; a first epitaxial layer disposed in the semiconductor substrate and between the first gate structure and the second gate structure, the first epitaxial layer including a first corner, a second corner and a third corner, the first corner protruding toward a first channel region under the first gate structure, the second corner protruding toward a second channel region under the second gate structure, the third corner protruding downwardly into the substrate; and a second epitaxial layer disposed in the semiconductor substrate and between the second gate structure and the shallow trench isolation layer, the second epitaxial layer including a fourth corner and a fifth corner, the fourth corner protruding toward the second channel region under the second gate structure, the fifth corner protruding downwardly into the substrate, wherein at least a portion of a top surface of the second epitaxial layer is slanted with respect to the major axis, and wherein the portion of the top surface of the second epitaxial layer that is slanted begins extending downward toward the shallow trench isolation layer at an interface of the second epitaxial layer with the second gate structure.