Patent ID: 7186446
Filing Date: 2007-03-06
Classification: C23C,H01L

Abstract:
1. A method for forming a bilayer of tantalum nitride and tantalum on a substrate, the method comprising: depositing a first layer on the substrate by plasma enhanced atomic layer deposition of a tantalum halide precursor in the presence of a plasma containing hydrogen and nitrogen; wherein the depositing comprises: a. exposing the substrate to the tantalum halide carried by an inert gas; b. exposing the substrate to the plasma; and c. repeating a. and b. approximately 40–800 times until a desired thickness of the first layer is obtained; and depositing a second layer by continuing plasma enhanced atomic layer deposition of a tantalum halide precursor in the presence of a plasma by reducing concentration of nitrogen in the plasma to zero so that a substantially nitrogen free second layer of amorphous tantalum is formed.