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

Claim 0:
1. A method of plasma processing comprising:
generating a glow phase of an electropositive plasma in a plasma processing chamber containing a first species, a second species, and a substrate comprising a major surface, the electropositive plasma comprising positive ions of the first species and electrons;
generating an electronegative plasma in an afterglow phase of the electropositive plasma in the plasma processing chamber by combining the electrons of the electropositive plasma with atoms or molecules of the second species, the electronegative plasma comprising the positive ions, and negative ions of the second species; and
in the afterglow phase, cyclically performing steps of
generating first neutral particles with average velocity towards and substantially normal to the major surface of the substrate by applying a negative bias voltage at the substrate, and
applying a non-negative bias voltage at the substrate.