Patent ID: 8028653
Filing Date: 2011-10-04
Classification: C23C,H01J

Abstract:
1. A system for plasma-enhanced chemical vapor deposition, comprising: a chamber having an anode and a filament that define an ion source; a workpiece in the chamber facing the ion source; electrodes supporting the filament, each of the electrodes having an inner post, an outer shell, and an insulator located between the inner post and the outer shell for electrically insulating the outer shell from the inner post; wherein the outer shell has axial pockets which have a pocket diameter that is greater than a bore diameter of the outer shells, and the insulators are located at opposite ends of the outer shell in respective ones of the axial pockets, such that proximal and distal ends of the inner posts extend axially beyond respectively ones of the insulators; a power source for applying an electrical bias to the workpiece and to the inner posts for transmission to the filament, such that no electrical potential is applied to the outer shells; and the ion source deposits carbon film on the workpiece and on the outer shells for building carbon film on the workpiece to a desired thickness, such that a stress generated in the carbon film deposited on the outer shells is less than a stress generated in the carbon film deposited on the workpiece.