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

Claim 8:
9. A method of plasma processing comprising:
flowing at least two gases into a plasma processing chamber comprising a radio frequency (RF) source power electrode, an RF bias power electrode, and a substrate disposed between the RF source electrode and the RF bias electrode, the gases comprising a first species and a second species;
applying RF source power to the gases to generate positive ions and electrons of the first species in an unobstructed region of the plasma processing chamber having unobstructed fluid communication with the substrate;
removing the RF source power from the gases to generate negative ions of the second species in the unobstructed region by combining the electrons of the first species with atoms or molecules of the second species; and
applying RF bias power to the substrate, after a predetermined delay and after the removal of the RF source power, to deliver neutral particles directly from the unobstructed region to the substrate, the RF bias power comprising a frequency less than about 10 MHz at the substrate.