Patent ID: 8716095
Filing Date: 2014-05-06
Classification: H01L

Abstract:
1. A manufacturing method of a gate stack with sacrificial oxygen-scavenging metal spacers, comprising: removing a replacement gate stack formed in an inter-device isolation dielectric layer to expose the top surface of a semiconductor substrate and sidewalls of spacers within the inter-device isolation dielectric layer; conformally depositing a metal layer covering the inter-device isolation dielectric layer and the semiconductor substrate; selectively etching the metal layer to remove the portions of the metal layer covering the inter-device isolation dielectric layer and the semiconductor substrate to form sacrificial oxygen-scavenging metal spacers, and only keeping the sacrificial oxygen-scavenging metal spacers in the inner periphery of the spacers; and sequentially forming an interfacial oxide layer, a high-K dielectric layer, and a metal gate electrode on the semiconductor substrate filling the space between the sacrificial oxygen-scavenging metal spacers, so as to form a gate stack structure.