Patent ID: 7993462
Filing Date: 2011-08-09
Classification: C23C

Abstract:
1. A substrate-supporting device having a top surface for placing a substrate thereon composed of a plurality of surfaces separated from each other and defined by a continuous concavity being in gas communication with at least one through-hole passing through the substrate-supporting device, said continuous concavity being adapted to allow gas to flow in the continuous concavity and through the through-hole under a substrate placed on the top surface, wherein the continuous concavity consists of: (i) a plurality of circular dimple depressions each having closed bottoms; (ii) straightly-extending depressed channels connecting substantially or nearly every two adjacent dimple depressions, wherein the dimple depressions and the depressed channels are formed in a pattern; and (iii) at least one ring-shaped depression having a bottom connecting to closed bottoms of the circular dimple and bottoms of the straightly-extending depressed channels, each ring-shaped depression having a shape different from the pattern, being formed immediately around and extending from the through-hole wherein the continuous concavity and the at least one through-hole are connected via the at least one ring-shaped depression, and wherein the at least one ring-shaped depression promotes discharging gas from the continuous concavity through the at least one through-hole, wherein the at least one through-hole is formed independently of the pattern and includes at least one through-hole used for a substrate lift pin.