Patent ID: 7604750

Claim:
A method for fabricating a semiconductor device, comprising: loading a wafer into a chamber including vertical sidewalls and a curved ceramic dome coated with a material having etch tolerance against a plasma, wherein the material is yttrium oxide; etching a gate structure formed on the wafer, thereby generating etch remnants; and removing the etch remnants by: using a gas of SF6 as a main etch gas, and wherein the vertical sidewalls and the curved ceramic dome are uniformly cleaned using a multi-step cleaning process including a plurality of steps in which the removing of the etch remnants on the curved ceramic dome is performed at pressures lower than that on the vertical sidewalls, wherein the removing of the etch remnants is performed under a source power of approximately 1,600 W supplied to an antenna coil and different pressures ranging from approximately 3 mTorr to approximately 90 mTorr, wherein the vertical sidewalls are cleaned from positions progressing along the vertical sidewalls in multiple steps, and wherein the chamber pressure is reduced in each of the multiple steps.