Patent ID: 6207557
Filing Date: 2001-03-27
Classification: H01L

Abstract:
A method of forming titanium nitride composite layer, comprising the steps of:depositing a first titanium nitride layer on a substrate by exposing the substrate to a first composite gas consisting essentially of TiCl.sub.4 and NH.sub.3 at respective first levels that establish a first ratio of TiCl.sub.4 to NH.sub.3 in a range between about 0.02 and 0.05 so that a ratio of chlorine atoms to nitrogen atoms in the first composite gas is in a range between about 0.08 and 0.2;annealing the first titanium nitride layer by exposing the first titanium nitride layer to a gas consisting essentially of NH.sub.3 ; anddepositing a second titanium nitride layer on the first titanium nitride layer by exposing the first titanium nitride layer to a second composite gas consisting essentially of TiCl.sub.4 and NH.sub.3 at respective second levels that establish a second ratio of TiCl.sub.4 to NH.sub.3 that is greater than the first ratio.