Patent ID: 8481379

Claim:
A method for manufacturing a Fin Field-Effect Transistor (FinFET), comprising: providing a substrate; forming a fin on the substrate, and forming a first dielectric layer on the substrate outside the fin; forming a dummy gate across the fin on both the first dielectric layer and the fin, and forming a cover layer on the tin and the first dielectric layer outside the dummy gate, wherein upper surfaces of both the cover layer and the dummy gate are in the same plane; removing portions of both the cover layer and the first dielectric layer at both sides of the dummy gate, so as to form a source/drain opening such that the fin at both sides of the dummy gate is exposed in the source/drain opening; filling the source/drain opening to form a source/drain region comprising the fin at both sides of the dummy gate; removing part of the dummy gate and removing the first dielectric layer under the dummy gate, so as to form a gate region opening such that the fin under the dummy gate is exposed in the gate region opening; and filling the gate region opening to form a gate covering the fin.