Patent ID: 7723648
Filing Date: 2010-05-25
Classification: C23C,F27D,H01J,H01L

Abstract:
1. A substrate holder for supporting a substrate in a processing system, comprising: a temperature controlled support base having a first temperature; a substrate support opposing said temperature controlled support base and configured to support the substrate; one or more heating elements coupled to said substrate support, and configured to heat the substrate support to a second temperature above said first temperature; and a thermal insulator disposed between said temperature controlled support base and said substrate support, wherein said thermal insulator comprises a material, which has a non-uniform spatial variation of thermal conductivity between the material from a substantially central region to a substantially edge region of said thermal insulator, or a non-uniform spatial variation of a thickness between the material from a substantially central region to a substantially edge region of said thermal insulator, or a non-uniform spatial variation of both the thermal conductivity and the thickness, wherein the thermal insulator has at least a first non-zero thickness thinner than a second non-zero thickness, the first non-zero thickness aligning with a protrusion on the support base so as to interlock the thermal insulator and the support base, and the heat transfer coefficient of the thermal insulator non-uniformly varies across said thermal insulator in accordance with said first non-zero thickness and said second non-zero thickness.