Patent ID: 7560396
Filing Date: 2009-07-14
Classification: H01L

Abstract:
1. A process for treating a substrate by plasma nitridation, comprising: providing the substrate having an oxide film thereon; and irradiating plasma having an electron temperature of 0.5 to 2.0 eV on the oxide film using a mixed gas comprising argon gas and nitrogen gas to form an oxynitride film, wherein the plasma is irradiated on the oxide film at a temperature of 250 to 500° C. and under a pressure of 7 to 260 Pa, a nitrogen atom content in the oxynitride film has a distribution such that the maximum value Ns of the nitrogen atom content in the oxynitride film at a surface of the oxynitride film opposite a surface facing the substrate is 10 to 40 atomic percent, and the maximum value Nb of the nitrogen atom content in the oxynitride film at the surface facing the substrate side is 0 to 10 atomic percent, the ratio Ns/Nb is 2 or more, and the oxynitride film has an electrical film thickness from 1.0 to 2.5 nm.