Patent ID: 9171927
Filing Date: 2015-10-27
Classification: H01L

Abstract:
1. A method comprising: providing a semiconductor structure, the semiconductor structure having a sacrificial gate on top of a substrate, at least a set of spacers of a first dielectric material adjacent to sidewalls of the sacrificial gate covering the substrate, and a raised source region and a raised drain region adjacent to the set of spacers; removing the set of spacers of the first dielectric material, wherein the removing of the set of spacers of the first dielectric material is selective to the sacrificial gate and to the raised source region and the raised drain region and creates a void between the raised source region and the sacrificial gate and a void between the raised drain region and the sacrificial gate, thereby exposing the substrate directly underneath thereof; depositing a conformal layer of a second dielectric material to the semiconductor structure, wherein the second dielectric material of the conformal layer directly covers the exposed substrate, the raised source region, the raised drain region, and the sacrificial gate, and fills at least partially bottoms of the void between the raised source region and the sacrificial gate and the void between the raised drain region and the sacrificial gate, depositing a third dielectric material over the second dielectric material such that the third dielectric material completely fills in the void between the raised source region and the sacrificial gate and the void between the raised drain region and the sacrificial gate that remains after deposition of the second dielectric material, the third dielectric material being different from the second dielectric material.