Patent ID: 7981808
Filing Date: 2011-07-19
Classification: C23C,H01L

Abstract:
1. A method of forming a gate dielectric layer, the method comprising: depositing a first dielectric layer over a semiconductor substrate by introducing oxygen plasma in a chamber of a tool from a remote plasma block of the tool and introducing a metal into the chamber from a metal source so as to form the first dielectric be a metal oxide; performing a plasma nitridation of the first dielectric layer in the chamber of the tool to form a nitrided dielectric layer by introducing nitrogen plasma into the chamber from the remote plasma block; after performing the plasma nitridation of the first dielectric layer, before any anneal occurring after the step of forming the first dielectric layer, and without removing the semiconductor substrate from the chamber of the tool, depositing a second dielectric layer on the nitrided dielectric layer using oxygen plasma from the remote plasma block and metal from the metal source so as to form the second dielectric layer to be the metal oxide; performing a plasma nitridation of the second dielectric layer without removing the semiconductor substrate from the chamber of the tool to form a second nitrided dielectric layer by introducing nitrogen plasma into the chamber from the remote plasma block; and annealing the first and second nitrided dielectric layers after the step of performing a plasma nitridation of the second dielectric layer.