Patent ID: 9299812
Filing Date: 2016-03-29
CPC Classification: H01L

Claim Text:
1. A method of forming a semiconductor device, comprising: forming a fin at an upper portion of a substrate, the fin extending longitudinally in a first direction; forming a gate structure that extends across the fin in a second direction and covers a side surface of the fin, and a gate spacer on sides of the gate structure; forming trenches in the fin spaced from each other along the fin in the first direction; and forming stressors in the trenches, respectively, such that the stressors are embedded in and stress the fin, wherein the forming of the trenches includes forming preliminary trenches by anisotropically etching the fin, forming an etching select area by oxidizing portions of the fin exposed by the preliminary trenches, and removing the etching select area, and the trenches are located near the gate structure on opposite sides of the gate structure, respectively.