Patent ID: 6140215
Filing Date: 2000-10-31
Classification: C23C,Y10S

Abstract:
A method for depositing a film on a substrate by chemical vapor deposition comprising:positioning said substrate within an enclosed chamber;introducing reactant gases into the chamber opposite said substrate through a reactant gas supply element spaced from said substrate;positioning a gas dispersing showerhead with gas-dispersing holes between the supply element and said substrate, the showerhead facing the substrate and spaced about one inch or less from said substrate; andcoupling a hollow cylinder between the reactant gas supply element and the showerhead, the cylinder spacing the showerhead in the range of 2 to 4 inches from the reactant gas supply element;directing the reactant gases through the cylinder to confine the gases over the showerhead electrode and produce a concentrated plasma proximate the showerhead;biasing the showerhead with RF energy such that the showerhead is operable as an electrode;exciting the reactant gases with the showerhead electrode and directing the reactant gases through the showerhead to form a plasma and deposit a film on said substrate by plasma enhanced chemical vapor deposition;whereby to yield improved reactant gas flow over said substrate and more efficient chemical vapor deposition of a film on said substrate.