Patent ID: 7541292
Filing Date: 2009-06-02
Classification: H01J,H01L

Abstract:
1. A plasma etch process for etching high aspect ratio openings in a dielectric film on a workpiece in a reactor having a ceiling electrode overlying the workpiece and an electrostatic chuck supporting the workpiece, comprising: injecting a first polymerizing etch process gas through a radially inward one of plural concentric gas injection zones in the ceiling electrode; injecting a second polymerizing etch process gas through a radially outward one of the plural concentric gas injection zones in the ceiling electrode, the compositions of said first and second process gases having first and second carbon-to-fluorine ratios that differ from one another; evacuating gas from said reactor through a pumping annulus surrounding an edge of the workpiece; and etching the high aspect ratio openings in the dielectric film with etch species derived from the etch process gas while depositing a polymer derived from the etch process gas onto the workpiece, by generating a plasma in the reactor.