Patent ID: 11915910
Assignee: TOKYO ELECTRON LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A method of plasma processing comprising cyclically performing:
applying radio frequency (RF) source power to a source electrode in a plasma processing chamber containing a substrate and gases comprising a first species and a second species to form a plasma comprising positive ions of the first species, neutral species of the second species, and electrons;
removing the RF source power from the source electrode for a predetermined duration to form negative ions of the second species; and
applying RF bias power to a lower electrode supporting the substrate after the predetermined duration to deliver neutral particles of the first species and the second species to the substrate, the RF bias power oscillating between a positive voltage and a negative voltage relative to a reference potential at a frequency greater than about 1 MHz and less than about 10 MHz.