Patent ID: 8323522
Filing Date: 2012-12-04
Classification: H01J,H01L

Abstract:
1. An etching method using a plasma reactor, the method comprising: a first changing step of, when a first etching condition is set, changing, by an inductive coil control unit, the number or arrangement structure of inductive coils connecting to a Radio Frequency (RF) source power supply unit of an Inductive Coupled Plasma (ICP) source power unit on the basis of the first etching condition; a step of applying, by the RF source power supply unit, RF source power to corresponding inductive coils connecting to the RF source power supply unit and generating high density plasma within a reaction chamber; a first etching step of etching, by the high density plasma, a first etch-target layer of a workpiece mounted on a cathode assembly within the reaction chamber during a first set time; a first stopping step of stopping, by the RF source power supply unit, applying the RF source power to the corresponding inductive coils connecting to the RF source power supply unit after the first set time; a second changing step of, when a second etching condition is set, changing, by the inductive coil control unit, the number or arrangement structure of the inductive coils connecting to the RF source power supply unit on the basis of the second etching condition; a step of applying, by the RF source power supply unit, RF source power to corresponding inductive coils connecting to the RF source power supply unit and generating low density plasma within the reaction chamber; a second etching step of etching, by the low density plasma, a second etch-target layer of the workpiece during a second set time; and a second stopping step of stopping, by the RF source power supply unit, applying the RF source power to the corresponding inductive coils connecting to the RF source power supply unit after the second set time.