Patent ID: 7910495

Claim:
A plasma oxidizing method comprising: mounting an object to be processed, having a surface containing silicon, on a mounting table disposed in a processing chamber of a plasma processing apparatus; forming a plasma of a processing gas including oxygen in the processing chamber; applying a high frequency bias to the object by supplying a high frequency power to the mounting table in formation of the plasma; and forming a silicon oxide film by oxidizing the silicon in the surface of the object by using the plasma, wherein the plasma is formed under the condition that a process pressure is 266 Pa to 1,333 Pa, wherein an output of the high frequency power is 0.015 to 5 W/cm 2 per unit area of the object, wherein the surface of the object has an uneven pattern with prominences and depressions, wherein the proportion of oxygen in the processing gas ranges from 10 to 50%, and wherein a process temperature ranges from 200 to 800° C.