Patent ID: 8372761

Claim:
A plasma oxidation processing method for forming a silicon oxide film by subjecting a processing object having a three-dimensional pattern to oxidation processing with a plasma, said method comprising: setting a processing object having a patterned irregularity on a mounting table provided in a processing chamber of a plasma processing apparatus; supplying a processing gas, containing oxygen in an amount of not less than 0.5% and less than 10%, into the processing chamber and keeping the pressure in the chamber at 1.3 to 665 Pa; and forming a plasma of the processing gas while applying a high-frequency power to the mounting table and thereby applying a high-frequency bias to the process object, thereby carrying out oxidation processing of the processing object with the plasma, wherein an output of the high-frequency power is 5 to 3600 W, wherein the frequency of the high-frequency power is 300 kHz to 60 MHz, and wherein processing temperature in the processing chamber is 200 to 800° C.