Patent ID: 7858467

Claim:
A method of manufacturing a semiconductor device, the method comprising: forming, on a surface of a semiconductor substrate, an isolation trench including sidewall parts and a bottom part, or a stepped structure including a first planar part, a second planar part, and a step part located at a boundary between the first planar part and the second planar part; and supplying oxidizing ions or nitriding ions contained in plasma generated by a microwave, a radio-frequency wave, or electron cyclotron resonance to the sidewall parts and the bottom part of the isolation trench or the first and second planar parts and the step part of the stepped structure by applying a predetermined voltage to the semiconductor substrate, thereby performing anisotropic oxidation or anisotropic nitridation of the sidewall parts and the bottom part of the isolation trench or the first and second planar parts and the step part of the stepped structure, wherein a temperature of the semiconductor substrate is equal to or higher than 300° C. when the oxidizing ions or nitriding ions contained in plasma are supplied.