Patent ID: 9721804
Date: 2017-08-01
CPC Classifications: H01L

Claim:
1. A semiconductor device, comprising: a substrate; a plurality of first fin-shaped structures on the substrate, wherein the substrate extending between and contacting sidewalls of the first fin-shaped structures comprises a completely planar surface; a second fin-shaped structure and a third fin-shaped structure adjacent to two sides of the first fin-shaped structures; a first trench between the first fin-shaped structures and the second fin-shaped structure, wherein a bottom surface of the first trench is lower than the completely planar surface between the first fin-shaped structures; and a second trench between the first fin-shaped structures and the third fin-shaped structure, wherein the bottom surfaces of the first trench and the second trench are lower than the completely planar surface between the first fin-shaped structures, wherein the width of each of the first fin-shaped structures is equal to a width of the first trench, wherein the depths of the first trench and the second trench are equal.