Patent ID: 9564332
Date: 2017-02-07
CPC Classifications: H01L

Claim:
1. A semiconductor device, comprising: a semiconductor substrate; a metal gate stack formed over the semiconductor substrate; an insulating layer formed over the semiconductor substrate and surrounding the metal gate stack, wherein the metal gate stack comprises a metal gate electrode, and the insulating layer has a first top surface facing away from the semiconductor substrate; and a metal oxide structure entirely and directly above the first top surface of the insulating layer, wherein the metal oxide structure has a second top surface and a lower surface, the lower surface is opposite to the second top surface and between the second top surface and the insulating layer, the entire lower surface is in direct contact with the first top surface of the insulating layer, and the metal oxide structure comprises an oxidized material of the metal gate electrode, wherein the lower surface of the metal oxide structure is substantially coplanar with an upper surface of the metal gate stack.