Patent ID: 9048178
Filing Date: 2015-06-02
Classification: H01J,H01L

Abstract:
1. A plasma etching method for etching a substrate corresponding to an etching object within an etching apparatus that includes a supply rate adjustment unit for adjusting a supply rate of an etching gas supplied to the substrate, a temperature adjustment unit for adjusting a temperature of the substrate placed on a stage along a radial direction, and a plasma generating unit for generating plasma within a space between the supply rate adjustment unit and the stage, the plasma etching method comprising: a control step in which the temperature adjustment unit controls the temperature of the substrate to be uniform within a substrate plane of the substrate at a first temperature; and an adjustment step in which the supply rate adjustment unit adjusts a concentration distribution of active species contained in the plasma generated by the plasma generation unit within the space above the substrate, wherein the adjustment step adjusts the supply rate of the etching gas according to whether a supply region on the substrate to which the etching gas is supplied corresponds to a region where a Peclet number, calculated by uL/D, is less than one or greater than one, wherein u denotes an etching gas flow rate, D denotes an etching gas diffusion coefficient within the space above the substrate corresponding to a radial edge side portion of the stage positioned radially outward with respect to a radial center side portion of the stage, and L denotes a distance between the radial edge side portion and the substrate.