Methods of forming material on a substrate, and a method of forming a field effect transistor gate oxide on a substrate

A method of forming a field effect transistor gate oxide on a substrate, comprising:

• positioning a substrate within a deposition chamber;
• chemisorbing a first metal-containing species monolayer onto the substrate within the chamber from a gaseous first precursor, the first metal-containing species monolayer being discontinuously formed over the substrate;
• exposing the substrate having the discontinuous first metal-containing species monolayer to a gaseous oxygen-containing second precursor different from the first precursor effective to react with the first metal-containing species to form a gate dielectric second metal oxide monolayer and effective to form an oxide reaction product of the oxygen-containing second precursor with substrate material not covered by the first metal-containing species monolayer;
• and
• exposing the substrate having the gate dielectric second metal oxide monolayer and the oxide reaction product to a halogen-containing third gaseous substance different from the first and second precursors effective to selectively remove the oxide reaction product from the substrate relative to the gate dielectric second metal oxide monolayer.