Patent ID: 7879187

Claim:
A plasma etching apparatus, comprising: a chamber; a substrate support disposed inside the chamber to support a substrate, wherein the substrate support has a diameter less than that of the substrate to expose a bottom-side region of the edge portion of the substrate; a shield disposed above a center portion of the substrate with a gap such that plasma is not generated between the shield and the center portion of the substrate to expose an edge portion thereof for preventing plasma from being generated above the center portion of the substrate except the edge portion; a curtain gas passageway for spraying a curtain gas to a space between the shield and the substrate; a reaction gas supply passageway and a gas injection nozzle for spraying a reaction gas to an area between a side surface of the shield and an inner sidewall of the chamber formed within the shield; an antenna disposed at a position on an outer wall of the chamber to apply plasma-generating power to an area between the edge portion of the substrate and an inner wall of the chamber; and a bias power applying unit for applying bias to the substrate support.