Patent ID: 7582166
Filing Date: 2009-09-01
Classification: C23C,C30B,H01L

Abstract:
1. A wafer holder for holding semiconductor substrate wafers in a chemical vapor deposition system, comprising: a unitary monolithic holder body having a top surface as an integral part of the holder body; a circular wafer recess in the top surface of the holder body, the wafer recess having an outer perimeter and an interior surface defined within the perimeter and being adapted to support a substrate wafer disposed entirely within the wafer recess and without any physical element between the surface of the substrate wafer facing the wafer recess and the interior surface of the wafer recess; a groove formed circularly into the interior surface of the wafer recess immediately adjacent and extending around the outer perimeter of the wafer recess; and a plurality of slots formed into the interior surface of the wafer recess in the holder body, substantially all of the slots connecting with the groove adjacent the outer perimeter of the wafer recess and extending radially inwardly therefrom and terminating at a spacing from the center of the wafer recess.