Patent ID: 7208198

Claim:
A chemical vapor deposition method of forming a barium strontium titanate-comprising dielectric layer having a varied concentration of barium and strontium within the layer, comprising: providing a substrate within a chemical vapor deposition reactor; providing barium and strontium within the reactor by flowing at least one metal organic precursor to the reactor, and providing titanium within the reactor, and flowing a constant composition oxidizer stream to the reactor, under conditions effective to deposit a barium strontium titanate-comprising dielectric layer on the substrate; the barium and strontium being provided within the reactor during all of the deposit of said layer at a substantially constant atomic ratio of barium to strontium; and during said deposit, changing a rate of flow of the constant composition oxidizer stream to the reactor at least once to effect a change in relative atomic concentration of barium to strontium within the deposited barium strontium titanate-comprising dielectric layer.