Patent ID: 8084375

Claim:
A hot edge ring configured to surround a semiconductor substrate in a plasma processing chamber wherein plasma is generated and used to process the semiconductor substrate, the plasma processing chamber comprising: a substrate support comprising a vertical sidewall extending between an outwardly extending annular support surface and a circular substrate support surface, the substrate support configured such that the semiconductor substrate is supported on the substrate support surface and an overhanging edge of the semiconductor substrate extends beyond the outer vertical sidewall; a radio-frequency (RF) coupling ring supported on the annular support surface; and the hot edge ring supported on the RF coupling ring; the hot edge ring including an annular body comprising: a lower surface configured to be supported on the RF coupling ring; an inner surface extending upwardly from an inner periphery of the lower surface and configured to surround the vertical sidewall; a first step extending outwardly from an upper periphery from the inner surface and downwardly from an inner periphery of a sloped upper surface, and configured to underlie the overhanging edge of the semiconductor substrate; the sloped upper surface comprising a truncated conical surface extending outwardly and upwardly from an upper periphery of the first step; an outer surface extending downwardly from an outer periphery of the sloped upper surface; and a second step extending inwardly from an lower periphery of the outer surface and upwardly from an outer periphery of the lower surface.