Patent ID: 6648976
Filing Date: 2003-11-18
Classification: G21K,H01J,H01L

Abstract:
A plasma processing apparatus comprising:a vacuum chamber for evacuating gas therefrom, for introducing reaction gas therein, and for generating plasma therein through high frequency power application; and a substrate hold stage within said vacuum chamber, with said substrate hold stage including a set face on which is to be held a substrate that is to be subjected to plasma processing, wherein said set face has an outer edge and a recessed portion such that when the substrate is held on said set face not less than 5% and not greater than 15% of a planar area of the substrate is in contact with said set face, said recessed portion comprising plural recesses that define a surface area such that the recesses corresponding to at least 80% of said surface area have a depth of not more than 100 &mgr;m and a recesses corresponding to from 5% to 20% of said surface area has a depth of greater than 100 &mgr;m and is located nearer to said outer edge of said set face than are said recesses having a death of not more 100 &mgr;m.