US Patent 10163904 Semiconductor device structure

A semiconductor device structure is provided. The semiconductor device structure includes a first circuit, a second circuit, and a dielectric dummy gate over a substrate. The first circuit includes a first N-type fin field-effect transistor (FinFET) and a first P-type fin field-effect transistor (FinFET). The second circuit includes a second N-type fin field-effect transistor (FinFET) and a second P-type fin field-effect transistor (FinFET) beside the second N-type FinFET. The dielectric dummy gate is positioned on a common boundary portion shared by the first circuit and the second circuit. The dielectric dummy gate includes a first portion and a second portion. The first portion is positioned between the first N-type FinFET and the second N-type FinFET and formed of a first strain material. The second portion is positioned between the first P-type FinFET and the second P-type FinFET and formed of a second strain material.