Patent ID: 8859434

Claim:
An etching method of etching a silicon carbide substrate placed on a platen in a processing chamber, comprising: alternately repeating a first step in which the silicon carbide substrate is heated to a temperature equal to or higher than 200° C., a processing gas including a fluorine-containing gas is supplied into the processing chamber and plasma is generated from the processing gas, and RF power is supplied to the platen to thereby apply a bias potential to the platen, thereby etching the silicon carbide substrate, and a second step in which the silicon carbide substrate is heated to a temperature equal to or higher than 200° C., supplying a processing gas including oxygen gas or nitrogen gas into the processing chamber and generating plasma from the processing gas, and supplying RF power to the platen thereby to apply a bias potential to the platen, thereby forming a silicon oxide film or a silicon nitride film as passivation film on the silicon carbide substrate.