Patent ID: 8409355
Filing Date: 2013-04-02
Classification: C23C,H01J,H01L

Abstract:
1. A process kit to cover a surface of a substrate support pedestal not covered by a substrate when the substrate is disposed on a support surface of the substrate support pedestal in a semiconductor process chamber, the process kit comprising: an annular body having an inner and an outer edge, and having an upper and lower surface, the upper surface disposed at a downward angle of between about 5-65 degrees in a radially outward direction from the inner edge toward the outer edge; an inner lip disposed proximate the inner edge and having a horizontal surface extending from the upper surface of the annular body, wherein the inner edge has a vertical distance measured between the lower surface of the annular body and the horizontal surface of the inner lip such that the horizontal surface of the inner lip is lower than the support surface when the process kit is disposed on the substrate support pedestal; and an outer lip disposed proximate the outer edge and extending downward from the lower surface, the outer lip having a shape conforming to a surface of substrate support pedestal having the outer lip disposed thereon, wherein a first portion of a lower surface of the outer lip is disposed at a downward angle in a radially outward direction from the inner edge toward the outer edge, wherein a second portion of the lower surface of the outer lip is disposed in a radially outward direction from the first portion of the lower surface of the outer lip, and wherein the second portion of the lower surface of the outer lip does not contact the substrate support pedestal when the process kit is disposed on the substrate support pedestal.