Patent ID: 9679816
Date: 2017-06-13
CPC Classifications: H01L

Claim:
1. A method of forming a semiconductor device, comprising: providing a substrate having a first region, a second region and a third region, wherein the first region and the second region are overlapped at the third region; forming a plurality of fin shaped structures on a surface of the substrate; forming a first mask layer parallel to an extending direction of the fin shaped structures, to cover each of the fin shaped structures outside the first region; removing a portion of each of the fin shaped structures in the first region to form a first surface; forming a second mask layer perpendicular to the extending direction of the fin shaped structures, to cover each of the fin shaped structures outside the second region; and removing a portion of each of the fin shaped structures in the second region to form a second surface, and to form a third surface in the third region, wherein the second surface is extended in a direction perpendicular to an extending direction of the fin shaped structure and has a length at least two times greater than a pitch of the fin shaped structure.