Patent ID: 8673707
Filing Date: 2014-03-18
Classification: H01L

Abstract:
1. A method for forming a metal gate, comprising: providing a substrate; forming a dummy gate on the substrate; forming spacers on sidewalls of the dummy gate; forming a stop layer on the substrate, the dummy gate and the spacers; forming a sacrificial dielectric layer on the stop layer; removing a part of the sacrificial dielectric layer and a top surface of the stop layer until the dummy gate is exposed, the sacrificial dielectric layer and the stop layer being lower than the dummy gate after the removing; removing a residual sacrificial dielectric layer; depositing an interlayer dielectric layer on the stop layer and the dummy gate after the removing the part of the sacrificial dielectric layer and the top surface of the stop layer; polishing the interlayer dielectric layer until the dummy gate is exposed, the interlayer dielectric layer being substantially flush with the dummy gate; removing the dummy gate to form a trench; and forming a metal gate in the trench.