Patent ID: 9502527
Filing Date: 2016-11-22
CPC Classification: H01L

Claim Text:
1. A semiconductor device structure, comprising: a semiconductor substrate; a gate stack over the semiconductor substrate, wherein the gate stack comprises a gate dielectric layer, a metal gate over the gate dielectric layer, a first insulating layer over the metal gate and a second insulating layer over the first insulating layer, materials of the first insulating layer and the second insulating layer are different, and the first insulating layer comprises an oxide material; and spacers over opposite sidewalls of the gate stack, wherein the spacers and the metal gate bound on a lateral side and a bottom side of a recess, and the first insulating layer and the second insulating layer are in the recess, wherein a first thickness of the first insulating layer measured from a top surface of the first insulating layer that is below a bottom of the second insulating layer to a bottom of the first insulating layer is greater than or equal to a second thickness of the second insulating layer measured from a top of the second insulating layer to the bottom of the second insulating layer.