Patent ID: 8551846
Filing Date: 2013-10-08
Classification: H01L

Abstract:
1. A method of fabricating a semiconductor device, comprising the steps of: providing a semiconductor substrate including a channel region; forming at least a first gate electrode structure on the channel region of the semiconductor substrate; forming a first trench in the semiconductor substrate at a first side of the first gate electrode structure, the first trench including at least a first plane that extends from a top surface of the semiconductor substrate, the first plane having a (111) crystal plane, at least a second plane that intersects the first plane, the second plane having a (111) crystal plane, and at least a first tip, the first tip defined by the intersection of the first plane and the second plane; and enlarging the first trench to form a second trench, the second trench including at least a third plane that intersects the top surface of the semiconductor substrate, at least a fourth plane that intersects the third plane, and at least a second tip, the second tip defined by the intersection of the third plane and the fourth plane forming the second tip nearer to a top surface of the semiconductor substrate than the first tip, wherein the step of enlarging the first trench to form the second trench comprises the step of: