Patent ID: 6245616
Filing Date: 2001-06-12
Classification: H01L

Abstract:
A method for forming an oxynitride gate dielectric in a semiconductor device comprising the steps of:providing a silicon substrate having a top surface,contacting said top surface of the silicon substrate with at least one gas that contains nitrogen and/or oxygen at a temperature between 500.degree. C. to 1200.degree. C. by flowing the said gas into a reaction chamber at a sufficiently high flow rate and a pressure between 1 m Torr and 20 atmospheres such that a layer of nitrogen-rich oxynitride having a nitrogen concentration of between 0.1 and 50 atomic percent is formed overlying the substrate, andcontacting said silicon substrate and said oxynitride layer with a gas mixture and at least one halogen species selected from the group consisting of CH.sub.2 Cl.sub.2, C.sub.2 H.sub.3 Cl.sub.3, C.sub.2 H.sub.2 Cl.sub.2, CH.sub.3 Cl and CHCl.sub.3 such that a layer of substantially silicon dioxide is formed between said oxynitride layer and said silicon substrate.