International Business Machines Corporation
Transistor device with ultra low-k self aligned contact cap and ultra low-k spacer

Abstract:

A method of forming a field effect transistor device is provided. The method includes forming a gate stack on a substrate, and forming a sidewall spacer on the gate stack. The method further includes forming a protective liner on the sidewall spacer, and forming a sacrificial gate cap on the gate stack. The method further includes forming a first dielectric fill layer on the protective liner, and forming a second dielectric fill layer on the first dielectric fill layer. The method further includes forming an opening in the second dielectric fill layer and the first dielectric fill layer that exposes the protective liner and sacrificial gate cap. The method further includes removing the sacrificial gate cap to form a cavity between the gate stack and the second dielectric fill layer, and removing the exposed sacrificial liner.