Patent ID: 11923171
Assignee: TOKYO ELECTRON LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A plasma processing apparatus comprising:
a plasma processing chamber;
a substrate support disposed in the plasma processing chamber, the substrate support including an electrostatic chuck and an edge ring disposed on the electrostatic chuck so as to surround a substrate on the substrate support, the electrostatic chuck including a first chucking electrode and a second chucking electrode disposed below the edge ring;
a first DC source configured to apply a positive DC voltage to the first chucking electrode during a first period and a second period;
a second DC source configured to apply the positive DC voltage to the second chucking electrode during one of the first period and the second period, and apply a negative DC voltage to the second chucking electrode during an other of the first period and the second period;
a first RF source configured to generate a first RF power to form a plasma in the plasma processing chamber, the first RF power having a first power level during the first period and a second power level during the second period, the second power level being less than the first power level; and
a second RF source configured to supply a second RF power to the substrate support, the second RF power having a third power level during the first period and a fourth power level during the second period, the fourth power level being less than the third power level,
wherein the second DC source is configured to apply the positive DC voltage to the second chucking electrode during the first period, and apply the negative DC voltage to the second chucking electrode during the second period,
wherein the first RF source is configured to gradually decrease the first RF power from the first power level to a zero power level during a first transition period between the first period and the second period, and maintain the zero power level during a second transition period between the first transition period and the second period, and
wherein the second RF source is configured to gradually decrease the second RF power from the third power level to the zero power level during the first transition period, and maintain the zero power level during the second transition period.