Patent ID: 7709403

Claim:
A method for forming a silicon carbide-oxide layered structure, comprising: step (a) of forming a SiO 2 layer on a surface of a silicon carbide layer; and after step (a), step (b) of placing the structure formed at step (a) in a chamber and exposing the SiO 2 layer to an atmosphere consisting of an inert gas and a gas selected from the group consisting of NO gas and N 2 O gas at a temperature higher than 1100° C. and lower than 1250° C. such that the SiO 2 layer changes into nitrogen containing oxide layer which has the relative dielectric constant of 3.0 or higher, wherein step (b) is performed, while flowing the gas selected from the group consisting of NO gas and N 2 O gas into the chamber, in an atmosphere where the pressure of the atmosphere is the atmospheric pressure, and the partial pressure of the gas selected from the group consisting of NO gas and N 2 O gas is equal to or higher than 6.67×10 3 Pa and equal to or lower than 5.33×10 4 Pa.